diff --git a/res/graphics/fonts/.gitattributes b/res/graphics/fonts/.gitattributes
deleted file mode 100644
index ca82ef549..000000000
--- a/res/graphics/fonts/.gitattributes
+++ /dev/null
@@ -1 +0,0 @@
-*.{psd,tga,ogg} filter=lfs diff=lfs merge=lfs -text
\ No newline at end of file
diff --git a/res/graphics/fonts/Braille.png b/res/graphics/fonts/Braille.png
index 2fd4ee11a..ba603fbbb 100755
Binary files a/res/graphics/fonts/Braille.png and b/res/graphics/fonts/Braille.png differ
diff --git a/res/graphics/fonts/LatinExtA_majuscule.png b/res/graphics/fonts/LatinExtA_majuscule.png
index 0c43d8468..8ab7ed002 100644
Binary files a/res/graphics/fonts/LatinExtA_majuscule.png and b/res/graphics/fonts/LatinExtA_majuscule.png differ
diff --git a/res/graphics/fonts/alphanumeric_small.png b/res/graphics/fonts/alphanumeric_small.png
new file mode 100644
index 000000000..23bce2c27
Binary files /dev/null and b/res/graphics/fonts/alphanumeric_small.png differ
diff --git a/res/graphics/fonts/ascii_majuscule.png b/res/graphics/fonts/ascii_majuscule.png
index b8f6ff339..bb2adcc07 100644
Binary files a/res/graphics/fonts/ascii_majuscule.png and b/res/graphics/fonts/ascii_majuscule.png differ
diff --git a/res/graphics/fonts/cyrilic_ef.png b/res/graphics/fonts/cyrilic_ef.png
index 1bb547166..d2a217969 100644
Binary files a/res/graphics/fonts/cyrilic_ef.png and b/res/graphics/fonts/cyrilic_ef.png differ
diff --git a/res/graphics/fonts/cyrilic_majuscule.png b/res/graphics/fonts/cyrilic_majuscule.png
index b586dcdab..e284256b9 100644
Binary files a/res/graphics/fonts/cyrilic_majuscule.png and b/res/graphics/fonts/cyrilic_majuscule.png differ
diff --git a/res/graphics/fonts/kana.png b/res/graphics/fonts/kana.png
index 24cb990e1..3b70966c1 100644
Binary files a/res/graphics/fonts/kana.png and b/res/graphics/fonts/kana.png differ
diff --git a/res/graphics/fonts/numeric_small.png b/res/graphics/fonts/numeric_small.png
deleted file mode 100644
index 0419393e7..000000000
Binary files a/res/graphics/fonts/numeric_small.png and /dev/null differ
diff --git a/res/locales/devmsg.csv b/res/locales/devmsg.csv
index 03f13b02a..85d1aadbf 100644
--- a/res/locales/devmsg.csv
+++ b/res/locales/devmsg.csv
@@ -1,8 +1,5 @@
 "STRING_ID";"IETF language tag(s) without dash";"enUS";"frFR";"esES";"deDE";"itIT";"ptBR";"ptPT";"ruRU";"elGR";"trTR";"daDK";"noNB";"svSE";"nlNL";"plPL";"fiFI";"jaJP";"zhCN";"zhTW";"koKR";"csCZ";"huHU";"roRO";"thTH";"bgBG";"heIL";"jakanaJP";"isIC"
 
-"DEV_MEMORY_SHORT_CAP";;"MEM";"MEM";;;;;;;;;;;;;;;"メモリー";;;"메모리";;;;;;;"メモリー";"MIN"
-"DEV_MEMORY_A_OF_B";;"%1$sM out of %2$sM";"%1$sM sur %2$sM";;;;;;;;;;;;;;;"%2$sM中%1$sM";;;"%2$sM 중 %1$sM";;;;;;;"%2$sM　ちゅう　%1$sM";"%1$sM af %2$sM"
-
 "DEV_COLOUR_LEGEND_GREEN";;" GREEN";" VERT";;;;;;;;;;;;;;;"緑";;;"녹";;;;;;;"　みどり";"grænn"
 "DEV_COLOUR_LEGEND_BLUE";;"  BLUE";" BLEU";;;;;;;;;;;;;;;"青";;;"청";;;;;;;"　　あお";"blár"
 "DEV_COLOUR_LEGEND_ORANGE";;"ORANGE";"ORANGE";;;;;;;;;;;;;;;"黄";;;"황";;;;;;;"オレンジ";"rauðugulur"
diff --git a/src/net/torvald/colourutil/Col216.kt b/src/net/torvald/colourutil/Col216.kt
index c92ab8f72..419cca0e0 100644
--- a/src/net/torvald/colourutil/Col216.kt
+++ b/src/net/torvald/colourutil/Col216.kt
@@ -59,16 +59,16 @@ class Col216 : LimitedColours {
 
     private fun assertRaw(i: Int) {
         if (i >= COLOUR_RANGE_SIZE || i < 0) {
-            println("i: " + i.toString())
+            System.err.println("Illegal colour input: $i")
             throw IllegalArgumentException()
         }
     }
 
     private fun assertRGB(r: Int, g: Int, b: Int) {
         if (r !in 0..MAX_STEP || g !in 0..MAX_STEP || b !in 0..MAX_STEP) {
-            println("r: " + r.toString())
-            println("g: " + g.toString())
-            println("b: " + b.toString())
+            System.err.println("Illegal colour input for channel r: $r")
+            System.err.println("Illegal colour input for channel g: $g")
+            System.err.println("Illegal colour input for channel b: $b")
             throw IllegalArgumentException()
         }
     }
diff --git a/src/net/torvald/colourutil/Col4096.kt b/src/net/torvald/colourutil/Col4096.kt
index 19afce6bf..a6a74bc44 100644
--- a/src/net/torvald/colourutil/Col4096.kt
+++ b/src/net/torvald/colourutil/Col4096.kt
@@ -111,17 +111,17 @@ class Col4096 : LimitedColours {
 
     private fun assertRaw(i: Int) {
         if (i > 0xFFFF || i < 0) {
-            println("i: " + i.toString())
+            System.err.println("Illegal colour input: $i")
             throw IllegalArgumentException()
         }
     }
 
     private fun assertARGB(a: Int, r: Int, g: Int, b: Int) {
         if (a !in 0..16 || r !in 0..16 || g !in 0..16 || b !in 0..16) {
-            println("a: " + a.toString())
-            println("r: " + r.toString())
-            println("g: " + g.toString())
-            println("b: " + b.toString())
+            System.err.println("Illegal colour input for channel a: $a")
+            System.err.println("Illegal colour input for channel r: $r")
+            System.err.println("Illegal colour input for channel g: $g")
+            System.err.println("Illegal colour input for channel b: $b")
             throw IllegalArgumentException()
         }
     }
diff --git a/src/net/torvald/imagefont/GameFontBase.kt b/src/net/torvald/imagefont/GameFontBase.kt
index eb92cb2f4..1b6b0a627 100644
--- a/src/net/torvald/imagefont/GameFontBase.kt
+++ b/src/net/torvald/imagefont/GameFontBase.kt
@@ -53,7 +53,7 @@ constructor() : Font {
 
     private fun isHangul(c: Char) = c.toInt() >= 0xAC00 && c.toInt() < 0xD7A4
 
-    private fun isAscii(c: Char) = c.toInt() > 0 && c.toInt() <= 0xFF
+    private fun isAscii(c: Char) = c.toInt() > 0x20 && c.toInt() <= 0xFF
 
     private fun isRunic(c: Char) = runicList.contains(c)
 
@@ -138,7 +138,9 @@ constructor() : Font {
 
             }
 
-            if (c == SHEET_ASCII_EF || c == SHEET_EXTA_EF || c == SHEET_CYRILIC_EF)
+            if (c == SHEET_COLOURCODE)
+                len += 0
+            else if (c == SHEET_ASCII_EF || c == SHEET_EXTA_EF || c == SHEET_CYRILIC_EF)
                 len += W_LATIN_NARROW
             else if (c == SHEET_KANA || c == SHEET_HANGUL || c == SHEET_CJK_PUNCT)
                 len += W_CJK
@@ -163,12 +165,19 @@ constructor() : Font {
         GL11.glColorMask(true, true, true, true)
         GL11.glBlendFunc(GL11.GL_SRC_ALPHA, GL11.GL_ONE_MINUS_SRC_ALPHA)
 
+        var thisCol = color
+
         // hangul fonts first
         //hangulSheet.startUse() // disabling texture binding to make the font coloured
         // JOHAB
         for (i in 0..s.length - 1) {
             val ch = s[i]
 
+            if (ch.isColourCode()) {
+                thisCol = colourKey[ch]!!
+                continue
+            }
+
             if (isHangul(ch)) {
                 val hIndex = ch.toInt() - 0xAC00
 
@@ -204,17 +213,17 @@ constructor() : Font {
                 hangulSheet.getSubImage(indexCho, choRow).draw(
                         Math.round(x + getWidthSubstr(s, i + 1) - glyphW).toFloat(),
                         Math.round(((H - H_HANGUL) / 2).toFloat() + y + 1f).toFloat(),
-                        color
+                        thisCol
                 )
                 hangulSheet.getSubImage(indexJung, jungRow).draw(
                         Math.round(x + getWidthSubstr(s, i + 1) - glyphW).toFloat(),
                         Math.round(((H - H_HANGUL) / 2).toFloat() + y + 1f).toFloat(),
-                        color
+                        thisCol
                 )
                 hangulSheet.getSubImage(indexJong, jongRow).draw(
                         Math.round(x + getWidthSubstr(s, i + 1) - glyphW).toFloat(),
                         Math.round(((H - H_HANGUL) / 2).toFloat() + y + 1f).toFloat(),
-                        color
+                        thisCol
                 )
             }
         }
@@ -246,6 +255,11 @@ constructor() : Font {
         for (i in 0..s.length - 1) {
             val ch = s[i]
 
+            if (ch.isColourCode()) {
+                thisCol = colourKey[ch]!!
+                continue
+            }
+
             if (isWenQuanYi1(ch)) {
                 val glyphW = getWidth("" + ch)
                 /*wenQuanYi_1.renderInUse(
@@ -257,7 +271,7 @@ constructor() : Font {
                 wenQuanYi_1.getSubImage(wenQuanYiIndexX(ch), wenQuanYi1IndexY(ch)).draw(
                         Math.round(x + getWidthSubstr(s, i + 1) - glyphW).toFloat(),
                         Math.round((H - H_UNIHAN) / 2 + y).toFloat(),
-                        color
+                        thisCol
                 )
             }
         }
@@ -269,6 +283,11 @@ constructor() : Font {
         for (i in 0..s.length - 1) {
             val ch = s[i]
 
+            if (ch.isColourCode()) {
+                thisCol = colourKey[ch]!!
+                continue
+            }
+
             if (isWenQuanYi2(ch)) {
                 val glyphW = getWidth("" + ch)
                 /*wenQuanYi_2.renderInUse(
@@ -280,7 +299,7 @@ constructor() : Font {
                 wenQuanYi_2.getSubImage(wenQuanYiIndexX(ch), wenQuanYi2IndexY(ch)).draw(
                         Math.round(x + getWidthSubstr(s, i + 1) - glyphW).toFloat(),
                         Math.round((H - H_UNIHAN) / 2 + y).toFloat(),
-                        color
+                        thisCol
                 )
             }
         }
@@ -292,6 +311,11 @@ constructor() : Font {
         for (i in 0..s.length - 1) {
             val ch = s[i]
 
+            if (ch.isColourCode()) {
+                thisCol = colourKey[ch]!!
+                continue
+            }
+
             if (!isHangul(ch) && !isUniHan(ch)) {
 
                 // if not init, endUse first
@@ -369,7 +393,7 @@ constructor() : Font {
                             else if (prevInstance == SHEET_FW_UNI) (H - H_HANGUL) / 2
                             else 0).toFloat(),
 
-                            color
+                            thisCol
                     )
                 }
                 catch (e: ArrayIndexOutOfBoundsException) {
@@ -413,6 +437,8 @@ constructor() : Font {
             return SHEET_CJK_PUNCT
         else if (isFullwidthUni(c))
             return SHEET_FW_UNI
+        else if (c.isColourCode())
+            return SHEET_COLOURCODE
         else
             return SHEET_ASCII_EM// fixed width punctuations
         // fixed width
@@ -464,6 +490,8 @@ constructor() : Font {
         Terrarum.appgc.graphics.setDrawMode(Graphics.MODE_NORMAL)
     }
 
+    fun Char.isColourCode() = colourKey.containsKey(this)
+
     companion object {
 
         lateinit internal var hangulSheet: SpriteSheet
@@ -510,6 +538,8 @@ constructor() : Font {
         internal val SHEET_WENQUANYI_1 = 13
         internal val SHEET_WENQUANYI_2 = 14
 
+        internal val SHEET_COLOURCODE = 255
+
         lateinit internal var sheetKey: Array<SpriteSheet>
         internal val asciiEFList = arrayOf(' ', '!', '"', '\'', '(', ')', ',', '.', ':', ';', 'I', '[', ']', '`', 'f', 'i', 'j', 'l', 't', '{', '|', '}', 0xA1.toChar(), 'Ì', 'Í', 'Î', 'Ï', 'ì', 'í', 'î', 'ï', '·')
 
@@ -554,5 +584,30 @@ constructor() : Font {
         internal val runicList = arrayOf('ᚠ', 'ᚢ', 'ᚦ', 'ᚬ', 'ᚱ', 'ᚴ', 'ᚼ', 'ᚾ', 'ᛁ', 'ᛅ', 'ᛋ', 'ᛏ', 'ᛒ', 'ᛘ', 'ᛚ', 'ᛦ', 'ᛂ', '᛬', '᛫', '᛭', 'ᛮ', 'ᛯ', 'ᛰ')
 
         internal var interchar = 0
+
+        val colourKey = hashMapOf(
+                Pair(0x11.toChar(), Color(0xFFFFFF)), //w
+                Pair(0x12.toChar(), Color(0xFF8080)), //r
+                Pair(0x13.toChar(), Color(0x80FF80)), //g
+                Pair(0x14.toChar(), Color(0x8080FF)), //b
+                Pair(0x15.toChar(), Color(0xFFE080)), //y
+                Pair(0x16.toChar(), Color(0x808080))  //k
+        )
+        val colToCode = hashMapOf(
+                Pair("w", 0x11.toChar()),
+                Pair("r", 0x12.toChar()),
+                Pair("g", 0x13.toChar()),
+                Pair("b", 0x14.toChar()),
+                Pair("y", 0x15.toChar()),
+                Pair("k", 0x16.toChar())
+        )
+        val codeToCol = hashMapOf(
+                Pair("w", colourKey[0x11.toChar()]),
+                Pair("r", colourKey[0x12.toChar()]),
+                Pair("g", colourKey[0x13.toChar()]),
+                Pair("b", colourKey[0x14.toChar()]),
+                Pair("y", colourKey[0x15.toChar()]),
+                Pair("k", colourKey[0x16.toChar()])
+        )
     }
 }
diff --git a/src/net/torvald/imagefont/GameFontWhite.kt b/src/net/torvald/imagefont/GameFontWhite.kt
index e756b6337..0edee3336 100644
--- a/src/net/torvald/imagefont/GameFontWhite.kt
+++ b/src/net/torvald/imagefont/GameFontWhite.kt
@@ -47,7 +47,7 @@ constructor() : GameFontBase() {
         GameFontBase.wenQuanYi_2 = SpriteSheet(
                 "./res/graphics/fonts/wenquanyi_11pt_part2.png", 16, 18, 2)
 
-        val shk = arrayOf<SpriteSheet>(
+        val shk = arrayOf(
                 GameFontBase.asciiSheet,
                 GameFontBase.asciiSheetEF,
                 GameFontBase.hangulSheet,
diff --git a/src/net/torvald/imagefont/SmallNumbers.kt b/src/net/torvald/imagefont/SmallNumbers.kt
deleted file mode 100644
index a38c038e6..000000000
--- a/src/net/torvald/imagefont/SmallNumbers.kt
+++ /dev/null
@@ -1,50 +0,0 @@
-package net.torvald.imagefont
-
-import org.newdawn.slick.Color
-import org.newdawn.slick.Font
-import org.newdawn.slick.SpriteSheet
-
-/**
- * Created by minjaesong on 16-04-15.
- */
-class SmallNumbers : Font {
-
-    internal val fontSheet: SpriteSheet
-
-    internal val W = 8
-    internal val H = 8
-
-    private val chars = arrayOf('0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '-')
-
-    init {
-        fontSheet = SpriteSheet("./res/graphics/fonts/numeric_small.png", W, H)
-    }
-
-    override fun getHeight(str: String): Int = H
-
-    override fun getWidth(str: String): Int = str.length * W
-
-    override fun getLineHeight(): Int = H
-
-    override fun drawString(x: Float, y: Float, text: String) = drawString(x, y, text, Color.white)
-
-    override fun drawString(x: Float, y: Float, text: String, col: Color) {
-        for (i in 0..text.length - 1) {
-            val index = charToSpriteNum(text.codePointAt(i))
-            if (index != null) {
-                fontSheet.getSubImage(index, 0).draw(
-                        x + i * W, y, col
-                )
-            }
-        }
-    }
-
-    override fun drawString(x: Float, y: Float, text: String, col: Color, startIndex: Int, endIndex: Int) {
-        throw UnsupportedOperationException()
-    }
-
-    private fun charToSpriteNum(ch: Int): Int? =
-            if (ch in '0'.toInt()..'9'.toInt()) ch - '0'.toInt()
-            else if (ch == '-'.toInt())         10
-            else null
-}
\ No newline at end of file
diff --git a/src/net/torvald/imagefont/TinyAlphNum.kt b/src/net/torvald/imagefont/TinyAlphNum.kt
new file mode 100644
index 000000000..44f9d83de
--- /dev/null
+++ b/src/net/torvald/imagefont/TinyAlphNum.kt
@@ -0,0 +1,78 @@
+package net.torvald.imagefont
+
+import org.newdawn.slick.Color
+import org.newdawn.slick.Font
+import org.newdawn.slick.SpriteSheet
+import java.util.*
+
+/**
+ * Created by minjaesong on 16-04-15.
+ */
+class TinyAlphNum : Font {
+
+    internal val fontSheet: SpriteSheet
+
+    internal val W = 8
+    internal val H = 8
+
+    private val chars = arrayOf(
+            '0','1','2','3','4','5','6','7',
+            '8','9','[','#','@',':','>','?',
+            ' ','A','B','C','D','E','F','G',
+            'H','I','&','.',']','(','<','\\',
+            '^','J','K','L','M','N','O','P',
+            'Q','R','-','¤','*',')',';','\'',
+            '+','/','S','T','U','V','W','X',
+            'Y','Z','_',',','%','=','"','!'
+    )
+    private val mappingTable = HashMap<Int, Int>()
+
+    init {
+        fontSheet = SpriteSheet("./res/graphics/fonts/alphanumeric_small.png", W, H)
+        chars.forEachIndexed { i, c -> mappingTable[c.toInt()] = i }
+    }
+
+    override fun getHeight(str: String): Int = H
+
+    override fun getWidth(str: String): Int {
+        var ret = 0
+        for (i in 0..str.length - 1) {
+            val c = str.codePointAt(i).toChar()
+            if (!c.isColourCode())
+                ret += W
+        }
+        return ret
+    }
+
+    override fun getLineHeight(): Int = H
+
+    override fun drawString(x: Float, y: Float, text: String) = drawString(x, y, text, Color.white)
+
+    override fun drawString(x: Float, y: Float, text: String, col: Color) {
+        var thisCol = col
+        var textPosOffset = 0
+        for (i in 0..text.length - 1) {
+            val index = charToSpriteNum(text.toUpperCase().codePointAt(i))
+            val ch = text[i]
+
+            if (ch.isColourCode()) {
+                thisCol = GameFontBase.colourKey[ch]!!
+                continue
+            }
+            if (index != null) {
+                fontSheet.getSubImage(index % 8, index / 8).draw(
+                        x + textPosOffset, y, thisCol
+                )
+            }
+            textPosOffset += W
+        }
+    }
+
+    override fun drawString(x: Float, y: Float, text: String, col: Color, startIndex: Int, endIndex: Int) {
+        throw UnsupportedOperationException()
+    }
+
+    private fun charToSpriteNum(ch: Int): Int? = mappingTable[ch]
+
+    fun Char.isColourCode() = GameFontBase.colourKey.containsKey(this)
+}
\ No newline at end of file
diff --git a/src/net/torvald/terrarum/Game.kt b/src/net/torvald/terrarum/Game.kt
index 2ec5983ce..884c7a911 100644
--- a/src/net/torvald/terrarum/Game.kt
+++ b/src/net/torvald/terrarum/Game.kt
@@ -34,11 +34,17 @@ import java.util.*
  */
 class Game @Throws(SlickException::class)
 constructor() : BasicGameState() {
+    private val ACTOR_UPDATE_RANGE = 4096
+
     internal var game_mode = 0
 
     lateinit var map: GameMap
 
-    val actorContainer = LinkedList<Actor>()
+    /**
+     * Linked list of Actors that is sorted by Actors' referenceID
+     */
+    val actorContainer = ArrayList<Actor>(128)
+    val actorcontainerInactive = ArrayList<Actor>(128)
     val uiContainer = LinkedList<UIHandler>()
 
     lateinit var consoleHandler: UIHandler
@@ -128,7 +134,6 @@ constructor() : BasicGameState() {
         update_delta = delta
         setAppTitle()
 
-        // GL at after_sunrise-noon_before_sunset
         map.updateWorldTime(delta)
         map.globalLight = globalLightByTime
 
@@ -139,12 +144,19 @@ constructor() : BasicGameState() {
         MapDrawer.update(gc, delta)
         MapCamera.update(gc, delta)
 
-        actorContainer.forEach { actor -> actor.update(gc, delta) }
-        actorContainer.forEach { actor ->
-            if (actor is Visible) {
+        actorContainer.forEach { actor -> // update actors
+            if (actor !is Visible
+                    || actor is Visible && distToActorSqr(actor, player) < ACTOR_UPDATE_RANGE.sqr())
+            // update if the does not have specific position. (visible)
+            // if the actor has position (visible), update only if it is within the range
+                actor.update(gc, delta)
+        }
+        actorContainer.forEach { actor -> // update sprite(s)
+            if (actor is Visible &&
+                    distToActorSqr(actor, player) <= (Terrarum.WIDTH.plus(actor.hitbox.width.div(2)).sqr() +
+                                                      Terrarum.HEIGHT.plus(actor.hitbox.height.div(2)).sqr())
+            ) { // if visible and within screen
                 actor.updateBodySprite(gc, delta)
-            }
-            if (actor is Glowing) {
                 actor.updateGlowSprite(gc, delta)
             }
         }
@@ -186,7 +198,14 @@ constructor() : BasicGameState() {
         MapCamera.renderBehind(gc, g)
 
         // draw actors
-        actorContainer.forEach { actor -> if (actor is Visible) actor.drawBody(gc, g) }
+        actorContainer.forEach { actor ->
+            if (actor is Visible &&
+                distToActorSqr(actor, player) <= (Terrarum.WIDTH.plus(actor.hitbox.width.div(2)).sqr() +
+                                                  Terrarum.HEIGHT.plus(actor.hitbox.height.div(2)).sqr())
+            ) { // if visible and within screen
+                actor.drawBody(gc, g)
+            }
+        }
         player.drawBody(gc, g)
 
         LightmapRenderer.renderLightMap()
@@ -204,12 +223,19 @@ constructor() : BasicGameState() {
         setBlendNormal()
 
         // draw actor glows
-        actorContainer.forEach { actor -> if (actor is Glowing) actor.drawGlow(gc, g) }
+        actorContainer.forEach { actor ->
+            if (actor is Visible &&
+                distToActorSqr(actor, player) <= (Terrarum.WIDTH.plus(actor.hitbox.width.div(2)).sqr() +
+                                                  Terrarum.HEIGHT.plus(actor.hitbox.height.div(2)).sqr())
+            ) {
+                actor.drawGlow(gc, g)
+            }
+        }
         player.drawGlow(gc, g)
 
         // draw reference ID if debugWindow is open
-        if (debugWindow.isVisible) {
-            actorContainer.forEach { actor ->
+        if (debugWindow.visible) {
+            actorContainer.forEachIndexed { i, actor ->
                 if (actor is Visible) {
                     g.color = Color.white
                     g.font = Terrarum.smallNumbers
@@ -218,6 +244,12 @@ constructor() : BasicGameState() {
                             actor.hitbox.posX,
                             actor.hitbox.pointedY + 4
                     )
+                    g.color = Color(0x80FF80)
+                    g.drawString(
+                            i.toString(),
+                            actor.hitbox.posX,
+                            actor.hitbox.pointedY + 12
+                    )
                     g.font = Terrarum.gameFont
                 }
             }
@@ -304,40 +336,67 @@ constructor() : BasicGameState() {
             (this and 0xff00).ushr(8).shl(10) or
             (this and 0xff0000).ushr(16).shl(20)
 
+    fun Float.sqr() = this * this
+    fun Int.sqr() = this * this
+    private fun distToActorSqr(a: Visible, p: Player) =
+            (a.hitbox.centeredX - p.hitbox.centeredX).sqr() + (a.hitbox.centeredY - p.hitbox.centeredY).sqr()
     /**
      * actorContainer extensions
      */
-    fun hasActor(ID: Int): Boolean {
-        for (actor in actorContainer) {
-            if (actor.referenceID == ID) return true
-        }
-        return false
-    }
+    fun hasActor(ID: Int): Boolean =
+            if (actorContainer.size == 0)
+                false
+            else
+                actorContainer.binarySearch(ID) >= 0
 
+    /**
+     * Remove actor and sort the list
+     */
     fun removeActor(ID: Int) {
         for (actor in actorContainer) {
-            if (actor.referenceID == ID)
+            if (actor.referenceID == ID) {
                 actorContainer.remove(actor)
+                actorContainer.sort()
+                break
+            }
         }
     }
 
+    /**
+     * Add actor and sort the list
+     */
     fun addActor(other: Actor): Boolean {
         if (hasActor(other.referenceID)) return false
         actorContainer.add(other)
+        actorContainer.sort()
         return true
     }
 
     fun getActor(ID: Int): Actor {
-        for (actor in actorContainer) {
-            if (actor.referenceID == ID)
-                return actor
-        }
-        throw NullPointerException("Actor with ID $ID does not exist.")
+        if (actorContainer.size == 0) throw IllegalArgumentException("Actor with ID $ID does not exist.")
+
+        val index = actorContainer.binarySearch(ID)
+        if (index < 0)
+            throw IllegalArgumentException("Actor with ID $ID does not exist.")
+        else
+            return actorContainer[index]
     }
 
-    fun addUI(other: UIHandler): Boolean {
-        if (uiContainer.contains(other)) return false
-        uiContainer.add(other)
-        return true
+    private fun ArrayList<Actor>.binarySearch(ID: Int): Int {
+        var low = 0
+        var high = actorContainer.size - 1
+
+        while (low <= high) {
+            val mid = (low + high).ushr(1) // safe from overflows
+            val midVal = get(mid)
+
+            if (ID > midVal.referenceID)
+                low = mid + 1
+            else if (ID < midVal.referenceID)
+                high = mid - 1
+            else
+                return mid // key found
+        }
+        return -(low + 1)  // key not found
     }
 }
diff --git a/src/net/torvald/terrarum/Terrarum.kt b/src/net/torvald/terrarum/Terrarum.kt
index a7f847b2c..be53c4e9e 100644
--- a/src/net/torvald/terrarum/Terrarum.kt
+++ b/src/net/torvald/terrarum/Terrarum.kt
@@ -3,7 +3,7 @@ package net.torvald.terrarum
 import net.torvald.imagefont.GameFontWhite
 import net.torvald.JsonFetcher
 import net.torvald.JsonWriter
-import net.torvald.imagefont.SmallNumbers
+import net.torvald.imagefont.TinyAlphNum
 import org.lwjgl.input.Controllers
 import org.lwjgl.opengl.GL11
 import org.newdawn.slick.*
@@ -47,7 +47,7 @@ constructor(gamename: String) : StateBasedGame(gamename) {
     @Throws(SlickException::class)
     override fun initStatesList(gc: GameContainer) {
         gameFont = GameFontWhite()
-        smallNumbers = SmallNumbers()
+        smallNumbers = TinyAlphNum()
 
         hasController = gc.input.controllerCount > 0
         if (hasController) {
diff --git a/src/net/torvald/terrarum/console/Authenticator.kt b/src/net/torvald/terrarum/console/Authenticator.kt
index de59f0f2f..fb272f874 100644
--- a/src/net/torvald/terrarum/console/Authenticator.kt
+++ b/src/net/torvald/terrarum/console/Authenticator.kt
@@ -9,6 +9,8 @@ import org.apache.commons.codec.digest.DigestUtils
  */
 class Authenticator : ConsoleCommand {
 
+    private var a = false
+
     override fun execute(args: Array<String>) {
         if (args.size == 2) {
             val pwd = args[1]
@@ -38,9 +40,4 @@ class Authenticator : ConsoleCommand {
     override fun printUsage() {
         CommandInterpreter.echoUnknownCmd("auth")
     }
-
-    companion object {
-
-        private var a = false
-    }
 }
diff --git a/src/net/torvald/terrarum/console/CommandInterpreter.kt b/src/net/torvald/terrarum/console/CommandInterpreter.kt
index 8230c595f..e0c777301 100644
--- a/src/net/torvald/terrarum/console/CommandInterpreter.kt
+++ b/src/net/torvald/terrarum/console/CommandInterpreter.kt
@@ -48,9 +48,9 @@ object CommandInterpreter {
                     }
                 }
                 catch (e: Exception) {
-                    println("[CommandInterpreter] :")
+                    System.err.print("[CommandInterpreter] ")
                     e.printStackTrace()
-                    Echo().execute(Lang.get("ERROR_GENERIC_TEXT"))
+                    Echo().error(Lang["ERROR_GENERIC_TEXT"])
                 }
 
             }
@@ -92,8 +92,8 @@ object CommandInterpreter {
         val sb = StringBuilder()
         val formatter = Formatter(sb)
 
-        Echo().execute(
-                formatter.format(Lang.get("DEV_MESSAGE_CONSOLE_COMMAND_UNKNOWN"), cmdname).toString())
+        Echo().error(
+                formatter.format(Lang["DEV_MESSAGE_CONSOLE_COMMAND_UNKNOWN"], cmdname).toString())
     }
 
     private class CommandInput(o: Array<Any>) {
diff --git a/src/net/torvald/terrarum/console/Echo.kt b/src/net/torvald/terrarum/console/Echo.kt
index 1adfff981..c91c0b0eb 100644
--- a/src/net/torvald/terrarum/console/Echo.kt
+++ b/src/net/torvald/terrarum/console/Echo.kt
@@ -1,5 +1,6 @@
 package net.torvald.terrarum.console
 
+import net.torvald.imagefont.GameFontBase
 import net.torvald.terrarum.Terrarum
 import net.torvald.terrarum.ui.ConsoleWindow
 
@@ -20,6 +21,10 @@ internal class Echo : ConsoleCommand {
         (Terrarum.game.consoleHandler.UI as ConsoleWindow).sendMessage(single_line)
     }
 
+    fun error(single_line: String) {
+        (Terrarum.game.consoleHandler.UI as ConsoleWindow).sendMessage("${GameFontBase.colToCode["r"]}$single_line")
+    }
+
     override fun printUsage() {
 
     }
diff --git a/src/net/torvald/terrarum/console/GetAV.kt b/src/net/torvald/terrarum/console/GetAV.kt
index 0b2845c97..88e207bd4 100644
--- a/src/net/torvald/terrarum/console/GetAV.kt
+++ b/src/net/torvald/terrarum/console/GetAV.kt
@@ -17,37 +17,73 @@ class GetAV : ConsoleCommand {
                 val av = Terrarum.game.player.actorValue
                 val keyset = av.keySet
 
+                echo.execute("== ActorValue list for player ==")
                 keyset.forEach { elem -> echo.execute("$elem = ${av[elem as String]}") }
-
             }
             else if (args.size != 3 && args.size != 2) {
                 printUsage()
             }
             else if (args.size == 2) {
-                echo.execute("player." + args[1] + " = "
-                             + Terrarum.game.player.actorValue[args[1]]
-                             + " ("
-                             + Terrarum.game.player.actorValue[args[1]]!!.javaClass.simpleName
-                             + ")")
+                // check if args[1] is number or not
+                if (!args[1].isNum()) { // args[1] is ActorValue name
+                    echo.execute("player.${args[1]} = "
+                                 + Terrarum.game.player.actorValue[args[1]]
+                                 + " ("
+                                 + Terrarum.game.player.actorValue[args[1]]!!.javaClass.simpleName
+                                 + ")"
+                    )
+                }
+                else { // args[1] is actor ID
+                    val av = Terrarum.game.getActor(args[1].toInt()).actorValue
+                    val keyset = av.keySet
+
+                    echo.execute("== ActorValue list for ${args[1].toInt()} ==")
+                    if (keyset.size == 0)
+                        echo.execute("(nothing)")
+                    else
+                        keyset.forEach { elem -> echo.execute("$elem = ${av[elem as String]}") }
+                }
             }
             else if (args.size == 3) {
-
+                val id = args[1].toInt()
+                val av = args[2]
+                echo.execute("$id.$av = " +
+                             Terrarum.game.getActor(id).actorValue[av] +
+                             " (" +
+                             Terrarum.game.getActor(id).actorValue[av]!!.javaClass.simpleName +
+                             ")"
+                )
             }
         }
         catch (e: NullPointerException) {
             if (args.size == 2) {
-                echo.execute(args[1] + ": actor value does not exist.")
+                echo.error(args[1] + ": actor value does not exist.")
             }
             else if (args.size == 3) {
-                echo.execute(args[2] + ": actor value does not exist.")
+                echo.error(args[2] + ": actor value does not exist.")
             }
             else {
                 throw NullPointerException()
             }
         }
+        catch (e1: IllegalArgumentException) {
+            if (args.size == 3) {
+                echo.error(args[1] + ": no actor with this ID.")
+            }
+        }
 
     }
 
+    fun String.isNum(): Boolean {
+        try {
+            this.toInt()
+            return true
+        }
+        catch (e: NumberFormatException) {
+            return false
+        }
+    }
+
     override fun printUsage() {
         val echo = Echo()
         echo.execute("Get desired actor value of specific target.")
diff --git a/src/net/torvald/terrarum/console/SetAV.kt b/src/net/torvald/terrarum/console/SetAV.kt
index 7b6d81a35..4464a169d 100644
--- a/src/net/torvald/terrarum/console/SetAV.kt
+++ b/src/net/torvald/terrarum/console/SetAV.kt
@@ -19,43 +19,81 @@ internal class SetAV : ConsoleCommand {
     }
 
     override fun execute(args: Array<String>) {
-        val echo = Echo()
 
-        // setav <id or "player"> <av> <val>
-        if (args.size != 4 && args.size != 3) {
-            printUsage()
-        }
-        else if (args.size == 3) {
+        fun parseAVInput(arg: String): Any {
             val `val`: Any
 
             try {
-                `val` = Integer(args[2]) // try for integer
+                `val` = Integer(arg) // try for integer
             }
             catch (e: NumberFormatException) {
 
                 try {
-                    `val` = args[2].toFloat() // try for float
+                    `val` = arg.toFloat() // try for float
                 }
                 catch (ee: NumberFormatException) {
-                    if (args[2].equals("__true", ignoreCase = true)) {
+                    if (arg.equals("__true", ignoreCase = true)) {
                         `val` = true
                     }
-                    else if (args[2].equals("__false", ignoreCase = true)) {
+                    else if (arg.equals("__false", ignoreCase = true)) {
                         `val` = false
                     }
                     else {
-                        `val` = args[2] // string if not number
+                        `val` = arg // string if not number
                     }
                 }
+            }
 
+            return `val`
+        }
+
+        val echo = Echo()
+
+        // setav <id, or blank for player> <av> <val>
+        if (args.size != 4 && args.size != 3) {
+            printUsage()
+        }
+        else if (args.size == 3) {
+            val `val` = parseAVInput(args[2])
+
+            // check if av is number
+            if (args[1].isNum()) {
+                echo.error("Illegal ActorValue “${args[1]}”: ActorValue cannot be a number.")
+                return
             }
 
             Terrarum.game.player.actorValue[args[1]] = `val`
-            echo.execute("Set " + args[1] + " to " + `val`)
+            echo.execute("Set ${args[1]} to $`val`")
         }
         else if (args.size == 4) {
+            try {
+                val id = args[1].toInt()
+                val `val` = parseAVInput(args[3])
 
+                // check if av is number
+                if (args[2].isNum()) {
+                    echo.error("Illegal ActorValue “${args[2]}”: ActorValue cannot be a number.")
+                    return
+                }
+
+                Terrarum.game.getActor(id).actorValue[args[2]] = `val`
+                echo.execute("Set ${args[2]} of $id to $`val`")
+            }
+            catch (e: IllegalArgumentException) {
+                if (args.size == 4)
+                    echo.error(args[1] + ": no actor with this ID.")
+            }
         }
 
     }
+
+    fun String.isNum(): Boolean {
+        try {
+            this.toInt()
+            return true
+        }
+        catch (e: NumberFormatException) {
+            return false
+        }
+    }
 }
diff --git a/src/net/torvald/terrarum/gameactors/Actor.kt b/src/net/torvald/terrarum/gameactors/Actor.kt
index 61be521b1..53cc60cf6 100644
--- a/src/net/torvald/terrarum/gameactors/Actor.kt
+++ b/src/net/torvald/terrarum/gameactors/Actor.kt
@@ -5,15 +5,20 @@ import org.newdawn.slick.GameContainer
 /**
  * Created by minjaesong on 16-03-14.
  */
-interface Actor {
+abstract class Actor : Comparable<Actor> {
 
-    fun update(gc: GameContainer, delta_t: Int)
+    abstract fun update(gc: GameContainer, delta_t: Int)
 
     /**
      * Valid RefID is equal to or greater than 32768.
      * @return Reference ID. (32768-0xFFFF_FFFF)
      */
-    var referenceID: Int
+    abstract var referenceID: Int
 
-    var actorValue: ActorValue
+    abstract var actorValue: ActorValue
+
+    override fun equals(other: Any?) = referenceID == (other as Actor).referenceID
+    override fun hashCode() = referenceID
+    override fun toString() = "ActorID: ${hashCode()}"
+    override fun compareTo(other: Actor): Int = this.referenceID - other.referenceID
 }
\ No newline at end of file
diff --git a/src/net/torvald/terrarum/gameactors/ActorWithBody.kt b/src/net/torvald/terrarum/gameactors/ActorWithBody.kt
index 5ead41124..da3cb25c0 100644
--- a/src/net/torvald/terrarum/gameactors/ActorWithBody.kt
+++ b/src/net/torvald/terrarum/gameactors/ActorWithBody.kt
@@ -16,7 +16,7 @@ import org.newdawn.slick.Graphics
  *
  * Created by minjaesong on 16-03-14.
  */
-open class ActorWithBody constructor() : Actor, Visible, Glowing {
+open class ActorWithBody constructor() : Actor(), Visible {
 
     override var actorValue: ActorValue = ActorValue()
 
@@ -26,15 +26,13 @@ open class ActorWithBody constructor() : Actor, Visible, Glowing {
     var baseHitboxH: Int = 0
 
     /**
-     * Velocity for newtonian sim.
-     * Fluctuation in, otherwise still, velocity is equal to acceleration.
-
+     * Velocity vector (broken down by axes) for newtonian sim.
      * Acceleration: used in code like:
      * veloY += 3.0
      * +3.0 is acceleration. You __accumulate__ acceleration to the velocity.
      */
-    @Volatile var veloX: Float = 0.toFloat()
-    @Volatile var veloY: Float = 0.toFloat()
+    var veloX: Float = 0.toFloat()
+    var veloY: Float = 0.toFloat()
     @Transient private val VELO_HARD_LIMIT = 10000f
 
     var grounded = false
@@ -61,16 +59,17 @@ open class ActorWithBody constructor() : Actor, Visible, Glowing {
     @Transient val nextHitbox = Hitbox(0f,0f,0f,0f)
 
     /**
-     * Physical properties
+     * Physical properties.
+     * Values derived from ActorValue must be @Transient.
      */
-    @Volatile @Transient var scale = 1f
-    @Volatile @Transient var mass = 2f
+    @Transient var scale = 1f
+    @Transient var mass = 2f
     @Transient private val MASS_LOWEST = 2f
     /** Valid range: [0, 1]  */
     var elasticity = 0f
         set(value) {
             if (value < 0)
-                throw IllegalArgumentException("[ActorWithBody] $value: valid elasticity value is [0, 1].")
+                throw IllegalArgumentException("[ActorWithBody] Invalid elasticity value: $value; valid elasticity value is [0, 1].")
             else if (value > 1) {
                 println("[ActorWithBody] Elasticity were capped to 1.")
                 field = ELASTICITY_MAX
@@ -89,11 +88,11 @@ open class ActorWithBody constructor() : Actor, Visible, Glowing {
      */
     @Transient private val METER = 24f
     /**
-     * [m / s^2] * SI_TO_GAME_ACC -> [px / IFrame^2]
+     * [m / s^2] * SI_TO_GAME_ACC -> [px / InternalFrame^2]
      */
     @Transient private val SI_TO_GAME_ACC = METER / FastMath.sqr(Terrarum.TARGET_FPS.toFloat())
     /**
-     * [m / s] * SI_TO_GAME_VEL -> [px / IFrame]
+     * [m / s] * SI_TO_GAME_VEL -> [px / InternalFrame]
      */
     @Transient private val SI_TO_GAME_VEL = METER / Terrarum.TARGET_FPS
 
@@ -131,6 +130,8 @@ open class ActorWithBody constructor() : Actor, Visible, Glowing {
 
     @Transient private val MASS_DEFAULT = 60f
 
+    internal val physSleep: Boolean
+        get() = veloX.abs() < 0.5 && veloY.abs() < 0.5
 
     private var posAdjustX = 0
     private var posAdjustY = 0
diff --git a/src/net/torvald/terrarum/gameactors/CollisionSolver.kt b/src/net/torvald/terrarum/gameactors/CollisionSolver.kt
new file mode 100644
index 000000000..e21cf218e
--- /dev/null
+++ b/src/net/torvald/terrarum/gameactors/CollisionSolver.kt
@@ -0,0 +1,104 @@
+package net.torvald.terrarum.gameactors
+
+import com.jme3.math.FastMath
+import net.torvald.terrarum.Terrarum
+import java.util.*
+
+/**
+ * Created by minjaesong on 16-04-22.
+ */
+object CollisionSolver {
+
+    private const val STARTPOINT = 1
+    private const val ENDPOINT = 2
+
+    private const val COLL_LIST_SIZE = 256
+    private const val COLL_CANDIDATES_SIZE = 128
+    private const val COLL_FINAL_CANDIDATES_SIZE = 16
+
+    private val collListX = ArrayList<CollisionMarkings>(COLL_LIST_SIZE)
+    private val collListY = ArrayList<CollisionMarkings>(COLL_LIST_SIZE)
+
+    private val collCandidateX = ArrayList<Pair<ActorWithBody, ActorWithBody>>(COLL_CANDIDATES_SIZE)
+    private val collCandidateY = ArrayList<Pair<ActorWithBody, ActorWithBody>>(COLL_CANDIDATES_SIZE)
+    private val collCandidates = ArrayList<Pair<ActorWithBody, ActorWithBody>>(COLL_FINAL_CANDIDATES_SIZE)
+
+    /**
+     * @link https://www.toptal.com/game/video-game-physics-part-ii-collision-detection-for-solid-objects
+     */
+    fun process() {
+        // mark list x
+        Terrarum.game.actorContainer.forEach { it ->
+            if (it is ActorWithBody) {
+                collListX.add(CollisionMarkings(it.hitbox.hitboxStart.x, STARTPOINT, it.referenceID))
+                collListX.add(CollisionMarkings(it.hitbox.hitboxEnd.x, ENDPOINT, it.referenceID))
+            }
+        }
+
+        // sort list x (will use Timsort with Java SE >= 8, Mergesort otherwise)
+        collListX.sortBy { it.pos }
+
+        // set candidateX
+
+        // mark list y
+        Terrarum.game.actorContainer.forEach { it ->
+            if (it is ActorWithBody) {
+                collListY.add(CollisionMarkings(it.hitbox.hitboxStart.y, STARTPOINT, it.referenceID))
+                collListY.add(CollisionMarkings(it.hitbox.hitboxEnd.y, ENDPOINT, it.referenceID))
+            }
+        }
+
+        // sort list y
+        collListY.sortBy { it.pos }
+
+        // set candidateY
+
+        // look for overlaps in candidate X/Y and put them into collCandidates
+
+        // solve collision for actors in collCandidates
+    }
+
+    private fun solveCollision(a: ActorWithBody, b: ActorWithBody) {
+
+    }
+
+    private infix fun ActorWithBody.isCollidingWith(other: ActorWithBody): Boolean {
+        val ax = this.hitbox.centeredX
+        val ay = this.hitbox.centeredY
+        val bx = other.hitbox.centeredX
+        val by = other.hitbox.centeredY
+
+        // will refer 'actor_dist_t' as 't' afterward
+        val actor_dist_t_sqr = ((ay - by).sqr() + (ax - bx).sqr()) // no sqrt; 'power' is slower than 'times'
+        val dist_x = (ax - bx).abs() // 'tx'
+        val dist_y = (ay - by).abs() // 'ty'
+        val tangent = dist_y / dist_x
+
+        var t_ax: Float; var t_ay: Float
+        if (dist_x > dist_y) {
+            t_ax = this.hitbox.width / 2
+            t_ay = t_ax * tangent
+        }
+        else {
+            t_ay = this.hitbox.height / 2
+            t_ax = t_ay * tangent
+        }
+
+        return (t_ax.sqr() + t_ay.sqr()) < actor_dist_t_sqr
+    }
+
+    fun Float.abs() = if (this < 0) -this else this
+    fun Float.sqr() = this * this
+
+    data class CollisionMarkings(
+            val pos: Float,
+            val kind: Int,
+            val actorID: Int
+    )
+
+    /**
+     * === Some useful physics knowledge ===
+     *
+     * * Momentum = mass × Velocity
+     */
+}
\ No newline at end of file
diff --git a/src/net/torvald/terrarum/gameactors/Glowing.kt b/src/net/torvald/terrarum/gameactors/Glowing.kt
deleted file mode 100644
index ca86c3f47..000000000
--- a/src/net/torvald/terrarum/gameactors/Glowing.kt
+++ /dev/null
@@ -1,13 +0,0 @@
-package net.torvald.terrarum.gameactors
-
-import org.newdawn.slick.GameContainer
-import org.newdawn.slick.Graphics
-
-/**
- * Created by minjaesong on 16-03-14.
- */
-interface Glowing {
-    fun drawGlow(gc: GameContainer, g: Graphics)
-
-    fun updateGlowSprite(gc: GameContainer, delta: Int)
-}
\ No newline at end of file
diff --git a/src/net/torvald/terrarum/gameactors/PhysTestBall.kt b/src/net/torvald/terrarum/gameactors/PhysTestBall.kt
index 85f589f09..135aa62a1 100644
--- a/src/net/torvald/terrarum/gameactors/PhysTestBall.kt
+++ b/src/net/torvald/terrarum/gameactors/PhysTestBall.kt
@@ -15,7 +15,7 @@ class PhysTestBall : ActorWithBody {
     constructor(): super() {
         setHitboxDimension(16, 16, 0, 0)
         isVisible = true
-        mass = 10f
+        actorValue[AVKey.BASEMASS] = 10f
 
         color = RoguelikeRandomiser.composeColourFrom(RoguelikeRandomiser.POTION_PRIMARY_COLSET)
     }
@@ -23,9 +23,9 @@ class PhysTestBall : ActorWithBody {
     override fun drawBody(gc: GameContainer, g: Graphics) {
         g.color = color
         g.fillOval(
-                hitbox!!.posX,
-                hitbox!!.posY,
-                hitbox!!.width,
-                hitbox!!.height)
+                hitbox.posX,
+                hitbox.posY,
+                hitbox.width,
+                hitbox.height)
     }
 }
\ No newline at end of file
diff --git a/src/net/torvald/terrarum/gameactors/Visible.kt b/src/net/torvald/terrarum/gameactors/Visible.kt
index 872f52771..bf176477e 100644
--- a/src/net/torvald/terrarum/gameactors/Visible.kt
+++ b/src/net/torvald/terrarum/gameactors/Visible.kt
@@ -12,4 +12,8 @@ interface Visible {
     fun drawBody(gc: GameContainer, g: Graphics)
 
     fun updateBodySprite(gc: GameContainer, delta: Int)
+
+    fun drawGlow(gc: GameContainer, g: Graphics)
+
+    fun updateGlowSprite(gc: GameContainer, delta: Int)
 }
diff --git a/src/net/torvald/terrarum/ui/BasicDebugInfoWindow.kt b/src/net/torvald/terrarum/ui/BasicDebugInfoWindow.kt
index 507c70dd7..54ad49e12 100644
--- a/src/net/torvald/terrarum/ui/BasicDebugInfoWindow.kt
+++ b/src/net/torvald/terrarum/ui/BasicDebugInfoWindow.kt
@@ -1,6 +1,7 @@
 package net.torvald.terrarum.ui
 
 import com.jme3.math.FastMath
+import net.torvald.imagefont.GameFontBase
 import net.torvald.terrarum.gamemap.PairedMapLayer
 import net.torvald.terrarum.langpack.Lang
 import net.torvald.terrarum.mapdrawer.LightmapRenderer
@@ -18,7 +19,7 @@ import java.util.*
 /**
  * Created by minjaesong on 16-03-14.
  */
-class BasicDebugInfoWindow : UICanvas {
+class BasicDebugInfoWindow:UICanvas {
 
     override var width: Int = Terrarum.WIDTH
     override var height: Int = Terrarum.HEIGHT
@@ -59,30 +60,35 @@ class BasicDebugInfoWindow : UICanvas {
         val mouseTileX = ((MapCamera.cameraX + gc.input.mouseX / Terrarum.game.screenZoom) / MapDrawer.TILE_SIZE).toInt()
         val mouseTileY = ((MapCamera.cameraY + gc.input.mouseY / Terrarum.game.screenZoom) / MapDrawer.TILE_SIZE).toInt()
 
-        g.color = Color.white
+        g.font = Terrarum.smallNumbers
+        g.color = GameFontBase.codeToCol["y"]
 
         val hitbox = player.hitbox
         val nextHitbox = player.nextHitbox
 
-        printLine(g, 1, "posX: "
+        val ccG = "${GameFontBase.colToCode["g"]}"
+
+        printLine(g, 1, "posX "
+                + ccG
                 + "${hitbox.pointedX.toString()}"
                 + " ("
                 + "${(hitbox.pointedX / MapDrawer.TILE_SIZE).toInt().toString()}"
                 + ")")
-        printLine(g, 2, "posY: "
+        printLine(g, 2, "posY "
+                + ccG
                 + hitbox.pointedY.toString()
                 + " ("
                 + (hitbox.pointedY / MapDrawer.TILE_SIZE).toInt().toString()
                 + ")")
 
-        printLine(g, 3, "veloX reported: ${player.veloX}")
-        printLine(g, 4, "veloY reported: ${player.veloY}")
+        printLine(g, 3, "veloX reported $ccG${player.veloX}")
+        printLine(g, 4, "veloY reported $ccG${player.veloY}")
 
-        printLineColumn(g, 2, 3, "veloX measured: ${xdelta}")
-        printLineColumn(g, 2, 4, "veloY measured: ${ydelta}")
+        printLineColumn(g, 2, 3, "veloX measured $ccG${xdelta}")
+        printLineColumn(g, 2, 4, "veloY measured $ccG${ydelta}")
 
-        printLine(g, 5, "grounded : ${player.grounded}")
-        printLine(g, 6, "noClip : ${player.noClip}")
+        printLine(g, 5, "grounded $ccG${player.grounded}")
+        printLine(g, 6, "noClip $ccG${player.noClip}")
 
         val lightVal: String
         var mtX = mouseTileX.toString()
@@ -100,7 +106,7 @@ class BasicDebugInfoWindow : UICanvas {
                     rawB.toString() + ")"
 
 
-        printLine(g, 7, "light at cursor : " + lightVal)
+        printLine(g, 7, "light@cursor $ccG$lightVal")
 
         val tileNo: String
         val tileNumRaw = Terrarum.game.map.getTileFromTerrain(mouseTileX, mouseTileY) ?: -1
@@ -108,33 +114,22 @@ class BasicDebugInfoWindow : UICanvas {
         val tiledmg = tileNumRaw % PairedMapLayer.RANGE
         tileNo = if (tileNumRaw == -1) "—" else "$tilenum:$tiledmg"
 
-        printLine(g, 8, "tile at cursor : $tileNo ($mtX, $mtY)")
+        printLine(g, 8, "tile@cursor $ccG$tileNo ($mtX, $mtY)")
 
         /**
          * Second column
          */
 
-        printLineColumn(g, 2, 1, "${Lang["MENU_OPTIONS_VSYNC"]} : " + Terrarum.appgc.isVSyncRequested)
-        printLineColumn(g, 2, 2, "Env colour temp : " + MapDrawer.getColTemp())
-        printLineColumn(g, 2, 5, "Time : ${Terrarum.game.map.worldTime.elapsedSeconds()}" +
+        printLineColumn(g, 2, 1, "VSync $ccG" + Terrarum.appgc.isVSyncRequested)
+        printLineColumn(g, 2, 2, "Env colour temp $ccG" + MapDrawer.getColTemp())
+        printLineColumn(g, 2, 5, "Time $ccG${Terrarum.game.map.worldTime.elapsedSeconds()}" +
                                  " (${Terrarum.game.map.worldTime.getFormattedTime()})")
-        printLineColumn(g, 2, 6, "Mass : ${player.mass}")
+        printLineColumn(g, 2, 6, "Mass $ccG${player.mass}")
 
         /**
          * On screen
          */
 
-        // Memory allocation
-        val memInUse = Terrarum.game.memInUse
-        val totalVMMem = Terrarum.game.totalVMMem
-
-        g.color = Color(0xFF7F00)
-        g.drawString(
-                Lang["DEV_MEMORY_SHORT_CAP"]
-                        + " : "
-                        + formatter.format(
-                        Lang["DEV_MEMORY_A_OF_B"], memInUse, totalVMMem), (Terrarum.WIDTH - 200).toFloat(), line(1).toFloat())
-
         // Hitbox
         val zoom = Terrarum.game.screenZoom
         g.color = Color(0x007f00)
@@ -148,12 +143,12 @@ class BasicDebugInfoWindow : UICanvas {
                 , (hitbox.pointedY - 1) * zoom - MapCamera.cameraY * zoom
                 , 3f, 3f)
         g.drawString(
-                Lang["DEV_COLOUR_LEGEND_GREEN"] + " :  hitbox", (Terrarum.WIDTH - 200).toFloat()
-                , line(2).toFloat())
+                "hitbox", (Terrarum.WIDTH - 15 * 8 - 2).toFloat().toFloat()
+                , line(1))
 
         // Next hitbox
         g.color = Color.blue
-        g.drawRect(nextHitbox!!.hitboxStart.x * zoom - MapCamera.cameraX * zoom
+        g.drawRect(nextHitbox.hitboxStart.x * zoom - MapCamera.cameraX * zoom
                 , nextHitbox.hitboxStart.y * zoom - MapCamera.cameraY * zoom
                 , nextHitbox.width * zoom
                 , nextHitbox.height * zoom)
@@ -163,21 +158,41 @@ class BasicDebugInfoWindow : UICanvas {
                 , (nextHitbox.pointedY - 1) * zoom - MapCamera.cameraY * zoom
                 , 3f, 3f)
         g.drawString(
-                Lang["DEV_COLOUR_LEGEND_BLUE"] + " :  nextHitbox", (Terrarum.WIDTH - 200).toFloat()
-                , line(3).toFloat())
+                "nextHitbox", (Terrarum.WIDTH - 15 * 8 - 2).toFloat().toFloat()
+                , line(2))
 
         drawHistogram(g, LightmapRenderer.histogram,
                 Terrarum.WIDTH - histogramW - 30,
                 Terrarum.HEIGHT - histogramH - 30
         )
+
+        g.color = GameFontBase.codeToCol["y"]
+        g.drawString("MEM ", (Terrarum.WIDTH - 15 * 8 - 2).toFloat(), 2f)
+        //g.drawString("FPS ", (Terrarum.WIDTH - 6 * 8 - 2).toFloat(), 10f)
+        g.drawString("Actors total ", 2f, Terrarum.HEIGHT - 10f)
+        g.drawString("Active ", (2 + 17*8).toFloat(), Terrarum.HEIGHT - 10f)
+
+        g.color = GameFontBase.codeToCol["g"]
+        g.drawString("${Terrarum.game.memInUse}M",
+                (Terrarum.WIDTH - 11 * 8 - 2).toFloat(), 2f)
+        g.drawString("/${Terrarum.game.totalVMMem}M",
+                (Terrarum.WIDTH - 6 * 8 - 2).toFloat(), 2f)
+        //g.drawString("${Terrarum.appgc.fps}",
+        //        (Terrarum.WIDTH - 2 * 8 - 2).toFloat(), 10f)
+        g.drawString("${Terrarum.game.actorContainer.size + Terrarum.game.actorcontainerInactive.size}",
+                (2 + 13*8).toFloat(), Terrarum.HEIGHT - 10f
+        )
+        g.drawString(Terrarum.game.actorContainer.size.toString(),
+                (2 + 24*8).toFloat(), Terrarum.HEIGHT - 10f
+        )
     }
 
     private fun printLine(g: Graphics, l: Int, s: String) {
-        g.drawString(s, 20f, line(l).toFloat())
+        g.drawString(s, 10f, line(l).toFloat())
     }
 
     private fun printLineColumn(g: Graphics, col: Int, row: Int, s: String) {
-        g.drawString(s, (20 + column(col)).toFloat(), line(row).toFloat())
+        g.drawString(s, (10 + column(col)).toFloat(), line(row).toFloat())
     }
 
     val histogramW = 256
@@ -196,6 +211,10 @@ class BasicDebugInfoWindow : UICanvas {
 
         g.color = uiColour
         g.fillRect(x.toFloat(), y.toFloat(), w.plus(1).toFloat(), h.toFloat())
+        g.color = Color.gray
+        g.drawString("0", x.toFloat(), y.toFloat() + h + 2)
+        g.drawString("255", x.toFloat() + w + 1 - 8*3, y.toFloat() + h + 2)
+        g.drawString("Histogramme", x + w / 2 - 5.5f * 8, y.toFloat() + h + 2)
 
         setBlendScreen()
         for (c in 0..2) {
@@ -219,9 +238,9 @@ class BasicDebugInfoWindow : UICanvas {
         setBlendNormal()
     }
 
-    private fun line(i: Int): Int = i * 20
+    private fun line(i: Int): Float = i * 10f
 
-    private fun column(i: Int): Int = 250 * (i - 1)
+    private fun column(i: Int): Float = 250f * (i - 1)
 
     override fun doOpening(gc: GameContainer, delta: Int) {
 
diff --git a/src/net/torvald/terrarum/ui/UIHandler.kt b/src/net/torvald/terrarum/ui/UIHandler.kt
index 0c701fedf..f1eb4b51f 100644
--- a/src/net/torvald/terrarum/ui/UIHandler.kt
+++ b/src/net/torvald/terrarum/ui/UIHandler.kt
@@ -33,7 +33,10 @@ constructor(val UI: UICanvas) {
     private var opening = false
     private var closing = false
     private var opened = false // fully opened
-    private var visible = false
+    private var _visible = false
+    val visible: Boolean
+        get() = if (alwaysVisible) true
+                else               _visible
 
     var openCloseCounter = 0
 
@@ -48,12 +51,12 @@ constructor(val UI: UICanvas) {
 
 
     fun update(gc: GameContainer, delta: Int) {
-        if (visible || alwaysVisible) {
+        if (_visible || alwaysVisible) {
             UI.update(gc, delta)
         }
 
         if (opening) {
-            visible = true
+            _visible = true
             openCloseCounter += delta
 
             // println("UI ${UI.javaClass.simpleName} (open)")
@@ -84,14 +87,14 @@ constructor(val UI: UICanvas) {
                 UI.endClosing(gc, delta)
                 closing = false
                 opened = false
-                visible = false
+                _visible = false
                 openCloseCounter = 0
             }
         }
     }
 
     fun render(gc: GameContainer, gameGraphicInstance: Graphics) {
-        if (visible || alwaysVisible) {
+        if (_visible || alwaysVisible) {
             UIGraphicInstance.clear()
             UIGraphicInstance.font = Terrarum.gameFont
 
@@ -113,22 +116,12 @@ constructor(val UI: UICanvas) {
         if (alwaysVisible) {
             throw RuntimeException("[UIHandler] Tried to 'set visibility of' constant UI")
         }
-        visible = b
+        _visible = b
     }
 
-    val isVisible: Boolean
-        get() {
-            if (alwaysVisible) {
-                return true
-            }
-            else {
-                return visible
-            }
-        }
-
     fun setAsAlwaysVisible() {
         alwaysVisible = true
-        visible = true
+        _visible = true
         opened = true
         opening = false
         closing = false
@@ -155,7 +148,7 @@ constructor(val UI: UICanvas) {
         if (alwaysVisible) {
             throw RuntimeException("[UIHandler] Tried to 'toggle opening of' constant UI")
         }
-        if (visible) {
+        if (_visible) {
             if (!closing) {
                 setAsClosing()
             }
@@ -168,61 +161,61 @@ constructor(val UI: UICanvas) {
     }
 
     fun processInput(input: Input) {
-        if (visible) {
+        if (_visible) {
             UI.processInput(input)
         }
     }
 
     fun keyPressed(key: Int, c: Char) {
-        if (visible && UI is UITypable) {
+        if (_visible && UI is UITypable) {
             UI.keyPressed(key, c)
         }
     }
 
     fun keyReleased(key: Int, c: Char) {
-        if (visible && UI is UITypable) {
+        if (_visible && UI is UITypable) {
             UI.keyReleased(key, c)
         }
     }
 
     fun mouseMoved(oldx: Int, oldy: Int, newx: Int, newy: Int) {
-        if (visible && UI is UIClickable) {
+        if (_visible && UI is UIClickable) {
             UI.mouseMoved(oldx, oldy, newx, newy)
         }
     }
 
     fun mouseDragged(oldx: Int, oldy: Int, newx: Int, newy: Int) {
-        if (visible && UI is UIClickable) {
+        if (_visible && UI is UIClickable) {
             UI.mouseDragged(oldx, oldy, newx, newy)
         }
     }
 
     fun mousePressed(button: Int, x: Int, y: Int) {
-        if (visible && UI is UIClickable) {
+        if (_visible && UI is UIClickable) {
             UI.mousePressed(button, x, y)
         }
     }
 
     fun mouseReleased(button: Int, x: Int, y: Int) {
-        if (visible && UI is UIClickable) {
+        if (_visible && UI is UIClickable) {
             UI.mouseReleased(button, x, y)
         }
     }
 
     fun mouseWheelMoved(change: Int) {
-        if (visible && UI is UIClickable) {
+        if (_visible && UI is UIClickable) {
             UI.mouseWheelMoved(change)
         }
     }
 
     fun controllerButtonPressed(controller: Int, button: Int) {
-        if (visible && UI is UIClickable) {
+        if (_visible && UI is UIClickable) {
             UI.controllerButtonPressed(controller, button)
         }
     }
 
     fun controllerButtonReleased(controller: Int, button: Int) {
-        if (visible && UI is UIClickable) {
+        if (_visible && UI is UIClickable) {
             UI.controllerButtonReleased(controller, button)
         }
     }
@@ -233,6 +226,6 @@ constructor(val UI: UICanvas) {
             if (alwaysVisible) {
                 return false
             }
-            return visible && !opening
+            return _visible && !opening
         }
 }
diff --git a/work_files/graphics/fonts/cjkpunct.png b/work_files/graphics/fonts/cjkpunct.png
deleted file mode 100644
index 63d969571..000000000
Binary files a/work_files/graphics/fonts/cjkpunct.png and /dev/null differ
diff --git a/work_files/graphics/fonts/futhark.png b/work_files/graphics/fonts/futhark.png
deleted file mode 100644
index 16009a5b4..000000000
Binary files a/work_files/graphics/fonts/futhark.png and /dev/null differ