diff --git a/lib/TerranVirtualDisk-src.jar b/lib/TerranVirtualDisk-src.jar
index 3bac2f485..efc8d1d65 100644
Binary files a/lib/TerranVirtualDisk-src.jar and b/lib/TerranVirtualDisk-src.jar differ
diff --git a/lib/TerranVirtualDisk.jar b/lib/TerranVirtualDisk.jar
index 6a05929f5..6a11b4951 100644
Binary files a/lib/TerranVirtualDisk.jar and b/lib/TerranVirtualDisk.jar differ
diff --git a/src/net/torvald/terrarum/AppLoader.java b/src/net/torvald/terrarum/AppLoader.java
index 7ef09a3a1..c7f467dc2 100644
--- a/src/net/torvald/terrarum/AppLoader.java
+++ b/src/net/torvald/terrarum/AppLoader.java
@@ -18,7 +18,6 @@ import com.github.strikerx3.jxinput.XInputDevice;
 import net.torvald.gdx.graphics.PixmapIO2;
 import net.torvald.getcpuname.GetCpuName;
 import net.torvald.terrarum.concurrent.ThreadExecutor;
-import net.torvald.terrarum.console.ConsoleCommand;
 import net.torvald.terrarum.controller.GdxControllerAdapter;
 import net.torvald.terrarum.controller.TerrarumController;
 import net.torvald.terrarum.controller.XinputControllerAdapter;
@@ -29,7 +28,6 @@ import net.torvald.terrarum.imagefont.TinyAlphNum;
 import net.torvald.terrarum.langpack.Lang;
 import net.torvald.terrarum.modulebasegame.IngameRenderer;
 import net.torvald.terrarum.modulebasegame.TerrarumIngame;
-import net.torvald.terrarum.modulebasegame.console.ToggleNoClip;
 import net.torvald.terrarum.modulebasegame.ui.ItemSlotImageFactory;
 import net.torvald.terrarum.utils.JsonFetcher;
 import net.torvald.terrarum.utils.JsonWriter;
diff --git a/src/net/torvald/terrarum/gameworld/GameWorld.kt b/src/net/torvald/terrarum/gameworld/GameWorld.kt
index 4a8e1c15d..af448a231 100644
--- a/src/net/torvald/terrarum/gameworld/GameWorld.kt
+++ b/src/net/torvald/terrarum/gameworld/GameWorld.kt
@@ -2,10 +2,6 @@
 package net.torvald.terrarum.gameworld
 
 import com.badlogic.gdx.utils.Disposable
-import com.badlogic.gdx.utils.Json
-import com.badlogic.gdx.utils.JsonWriter
-import com.badlogic.gdx.utils.compression.Lzma
-import net.torvald.UnsafePtrInputStream
 import net.torvald.gdx.graphics.Cvec
 import net.torvald.terrarum.*
 import net.torvald.terrarum.AppLoader.printdbg
@@ -14,16 +10,10 @@ import net.torvald.terrarum.blockproperties.BlockCodex
 import net.torvald.terrarum.blockproperties.Fluid
 import net.torvald.terrarum.gameactors.WireActor
 import net.torvald.terrarum.gameitem.ItemID
-import net.torvald.terrarum.modulecomputers.virtualcomputer.tvd.ByteArray64GrowableOutputStream
 import net.torvald.terrarum.realestate.LandUtil
-import net.torvald.terrarum.serialise.Ascii85
-import net.torvald.terrarum.serialise.Common
-import net.torvald.terrarum.serialise.bytesToZipdStr
 import net.torvald.terrarum.utils.*
 import net.torvald.util.SortedArrayList
-import org.apache.commons.codec.digest.DigestUtils
 import org.dyn4j.geometry.Vector2
-import java.util.zip.GZIPOutputStream
 import kotlin.math.absoluteValue
 
 typealias BlockAddress = Long
@@ -49,7 +39,7 @@ class GameWorld() : Disposable {
         internal set
     var lastPlayTime: Long = AppLoader.getTIME_T()
         internal set // there's a case of save-and-continue-playing
-    var totalPlayTime: Int = 0
+    var totalPlayTime: Long = 0
         internal set
 
     /** Used to calculate play time */
@@ -119,7 +109,7 @@ class GameWorld() : Disposable {
     /**
      * Create new world
      */
-    constructor(worldIndex: Int, width: Int, height: Int, creationTIME_T: Long, lastPlayTIME_T: Long, totalPlayTime: Int): this() {
+    constructor(worldIndex: Int, width: Int, height: Int, creationTIME_T: Long, lastPlayTIME_T: Long, totalPlayTime: Long): this() {
         if (width <= 0 || height <= 0) throw IllegalArgumentException("Non-positive width/height: ($width, $height)")
 
         this.worldIndex = worldIndex
diff --git a/src/net/torvald/terrarum/modulebasegame/console/Load.kt b/src/net/torvald/terrarum/modulebasegame/console/Load.kt
index 367a5d528..6786a669d 100644
--- a/src/net/torvald/terrarum/modulebasegame/console/Load.kt
+++ b/src/net/torvald/terrarum/modulebasegame/console/Load.kt
@@ -1,20 +1,16 @@
 package net.torvald.terrarum.modulebasegame.console
 
-import com.badlogic.gdx.utils.JsonValue
 import net.torvald.terrarum.AppLoader
-import net.torvald.terrarum.AppLoader.printdbg
-import net.torvald.terrarum.Terrarum
 import net.torvald.terrarum.console.ConsoleCommand
 import net.torvald.terrarum.console.Echo
-import net.torvald.terrarum.modulebasegame.TerrarumIngame
-import net.torvald.terrarum.modulecomputers.virtualcomputer.tvd.DiskEntry
+import net.torvald.terrarum.modulecomputers.virtualcomputer.tvd.ByteArray64Reader
 import net.torvald.terrarum.modulecomputers.virtualcomputer.tvd.EntryFile
 import net.torvald.terrarum.modulecomputers.virtualcomputer.tvd.VDUtil
 import net.torvald.terrarum.serialise.*
-import net.torvald.terrarum.utils.JsonFetcher
 import java.io.File
 import java.io.IOException
-import java.nio.ByteBuffer
+import java.io.StringReader
+import kotlin.reflect.full.declaredMemberProperties
 
 /**
  * Created by minjaesong on 2021-08-30.
@@ -29,12 +25,16 @@ object Load : ConsoleCommand {
                 val disk = VDUtil.readDiskArchive(file, charset = charset)
 
                 val metaFile = disk.entries[-1]!!
-                val metaReader = ByteArray64Reader(metaFile.contents.serialize().array, charset)
-                val meta = Common.jsoner.fromJson(JsonValue::class.java, metaReader)
 
-                JsonFetcher.forEach(meta) { key, value ->
-                    println("$key\t$value")
+                val metaReader = ByteArray64Reader((metaFile.contents as EntryFile).getContent(), Common.CHARSET)
+                val meta = Common.jsoner.fromJson(WriteMeta.WorldMeta::class.java, metaReader)
+
+                WriteMeta.WorldMeta::class.declaredMemberProperties.forEach {
+                    println("${it.name} = ${it.get(meta)}")
                 }
+
+                println(WriteMeta.unasciiAndUnzipStr(meta.blocks))
+                println(meta.loadorder.joinToString())
             }
             catch (e: IOException) {
                 Echo("Load: IOException raised.")
diff --git a/src/net/torvald/terrarum/modulebasegame/console/ReaderTest.kt b/src/net/torvald/terrarum/modulebasegame/console/ReaderTest.kt
index 3433f8859..c340110d8 100644
--- a/src/net/torvald/terrarum/modulebasegame/console/ReaderTest.kt
+++ b/src/net/torvald/terrarum/modulebasegame/console/ReaderTest.kt
@@ -2,8 +2,8 @@ package net.torvald.terrarum.modulebasegame.console
 
 import net.torvald.terrarum.console.ConsoleCommand
 import net.torvald.terrarum.console.Echo
-import net.torvald.terrarum.serialise.ByteArray64Reader
-import net.torvald.terrarum.serialise.ByteArray64Writer
+import net.torvald.terrarum.modulecomputers.virtualcomputer.tvd.ByteArray64Reader
+import net.torvald.terrarum.modulecomputers.virtualcomputer.tvd.ByteArray64Writer
 import net.torvald.terrarum.serialise.Common
 import net.torvald.terrarum.serialise.toUint
 import java.io.File
diff --git a/src/net/torvald/terrarum/serialise/Ascii85.kt b/src/net/torvald/terrarum/serialise/Ascii85.kt
index ffe61cddc..66f14c537 100644
--- a/src/net/torvald/terrarum/serialise/Ascii85.kt
+++ b/src/net/torvald/terrarum/serialise/Ascii85.kt
@@ -6,8 +6,13 @@ package net.torvald.terrarum.serialise
  * just gzip the inputstream instead!
  */
 object Ascii85 {
-    /** As per RFC-1924 */
-    private const val CHAR_TABLE = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz!#${'$'}%&()*+-;<=>?@^_`{|}~"
+    /** My own string set that:
+     * - no "/": avoids nonstandard JSON comment key which GDX will happily parse away
+     * - no "\": you know what I mean\\intention
+     * - no "$": avoids Kotlin string template
+     * - no "[{]},": even the dumbest parser can comprehend the output
+     */
+    private const val CHAR_TABLE = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ!#%&'()*+-.:;<=>?@^_`|~"
     /** As per Adobe standard */
     //private val CHAR_TABLE = (33 until (33+85)).toList().map { it.toChar() }.joinToString("") // testing only!
 
diff --git a/src/net/torvald/terrarum/serialise/Common.kt b/src/net/torvald/terrarum/serialise/Common.kt
index 15e46775d..0a6b249e9 100644
--- a/src/net/torvald/terrarum/serialise/Common.kt
+++ b/src/net/torvald/terrarum/serialise/Common.kt
@@ -3,7 +3,6 @@ package net.torvald.terrarum.serialise
 import com.badlogic.gdx.utils.Json
 import com.badlogic.gdx.utils.JsonValue
 import com.badlogic.gdx.utils.JsonWriter
-import net.torvald.terrarum.AppLoader.printdbg
 import net.torvald.terrarum.console.EchoError
 import net.torvald.terrarum.gameworld.BlockLayer
 import net.torvald.terrarum.gameworld.GameWorld
@@ -272,215 +271,3 @@ object Common {
         return unzipdBytes
     }
 }
-
-class ByteArray64Writer(val charset: Charset) : Writer() {
-
-    private val acceptableCharsets = arrayOf(Charsets.UTF_8, Charset.forName("CP437"))
-
-    init {
-        if (!acceptableCharsets.contains(charset))
-            throw UnsupportedCharsetException(charset.name())
-    }
-
-    private val ba64 = ByteArray64()
-    private var closed = false
-    private var surrogateBuf = 0
-
-    init {
-        this.lock = ba64
-    }
-
-    private fun checkOpen() {
-        if (closed) throw ClosedChannelException()
-    }
-
-    private fun Int.isSurroHigh() = this.ushr(10) == 0b110110
-    private fun Int.isSurroLow() = this.ushr(10) == 0b110111
-    private fun Int.toUcode() = 'u' + this.toString(16).uppercase().padStart(4,'0')
-
-    /**
-     * @param c not a freakin' codepoint; just a Java's Char casted into Int
-     */
-    override fun write(c: Int) {
-        checkOpen()
-        when (charset) {
-            Charsets.UTF_8 -> {
-                if (surrogateBuf == 0 && !c.isSurroHigh() && !c.isSurroLow())
-                    writeUtf8Codepoint(c)
-                else if (surrogateBuf == 0 && c.isSurroHigh())
-                    surrogateBuf = c
-                else if (surrogateBuf != 0 && c.isSurroLow())
-                    writeUtf8Codepoint(65536 + surrogateBuf.and(1023).shl(10) or c.and(1023))
-                // invalid surrogate pair input
-                else
-                    throw IllegalStateException("Surrogate high: ${surrogateBuf.toUcode()}, surrogate low: ${c.toUcode()}")
-            }
-            Charset.forName("CP437") -> {
-                ba64.add(c.toByte())
-            }
-            else -> throw UnsupportedCharsetException(charset.name())
-        }
-    }
-
-    fun writeUtf8Codepoint(codepoint: Int) {
-        when (codepoint) {
-            in 0..127 -> ba64.add(codepoint.toByte())
-            in 128..2047 -> {
-                ba64.add((0xC0 or codepoint.ushr(6).and(31)).toByte())
-                ba64.add((0x80 or codepoint.and(63)).toByte())
-            }
-            in 2048..65535 -> {
-                ba64.add((0xE0 or codepoint.ushr(12).and(15)).toByte())
-                ba64.add((0x80 or codepoint.ushr(6).and(63)).toByte())
-                ba64.add((0x80 or codepoint.and(63)).toByte())
-            }
-            in 65536..1114111 -> {
-                ba64.add((0xF0 or codepoint.ushr(18).and(7)).toByte())
-                ba64.add((0x80 or codepoint.ushr(12).and(63)).toByte())
-                ba64.add((0x80 or codepoint.ushr(6).and(63)).toByte())
-                ba64.add((0x80 or codepoint.and(63)).toByte())
-            }
-            else -> throw IllegalArgumentException("Not a unicode code point: U+${codepoint.toString(16).uppercase()}")
-        }
-    }
-
-    override fun write(cbuf: CharArray) {
-        checkOpen()
-        write(String(cbuf))
-    }
-
-    override fun write(str: String) {
-        checkOpen()
-        str.toByteArray(charset).forEach { ba64.add(it) }
-    }
-
-    override fun write(cbuf: CharArray, off: Int, len: Int) {
-        write(cbuf.copyOfRange(off, off + len))
-    }
-
-    override fun write(str: String, off: Int, len: Int) {
-        write(str.substring(off, off + len))
-    }
-
-    override fun close() { closed = true }
-    override fun flush() {}
-
-    fun toByteArray64() = if (closed) ba64 else throw IllegalAccessException("Writer not closed")
-}
-
-class ByteArray64Reader(val ba: ByteArray64, val charset: Charset) : Reader() {
-
-    private val acceptableCharsets = arrayOf(Charsets.UTF_8, Charset.forName("CP437"))
-
-    init {
-        if (!acceptableCharsets.contains(charset))
-            throw UnsupportedCharsetException(charset.name())
-    }
-
-    private var readCursor = 0L
-    private val remaining
-        get() = ba.size - readCursor
-
-    /**
-     *   U+0000 .. U+007F 	0xxxxxxx
-     *   U+0080 .. U+07FF 	110xxxxx 	10xxxxxx
-     *   U+0800 .. U+FFFF 	1110xxxx 	10xxxxxx 	10xxxxxx
-     * U+10000 .. U+10FFFF 	11110xxx 	10xxxxxx 	10xxxxxx 	10xxxxxx
-     */
-    private fun utf8GetCharLen(head: Byte) = when (head.toInt() and 255) {
-        in 0b11110_000..0b11110_111 -> 4
-        in 0b1110_0000..0b1110_1111 -> 3
-        in 0b110_00000..0b110_11111 -> 2
-        in 0b0_0000000..0b0_1111111 -> 1
-        else -> throw IllegalArgumentException("Invalid UTF-8 Character head byte: ${head.toInt() and 255}")
-    }
-
-    /**
-     * @param list of bytes that encodes one unicode character. Get required byte length using [utf8GetCharLen].
-     * @return A codepoint of the character.
-     */
-    private fun utf8decode(bytes0: List<Byte>): Int {
-        val bytes = bytes0.map { it.toInt() and 255 }
-        var ret = when (bytes.size) {
-            4 -> (bytes[0] and 7) shl 18
-            3 -> (bytes[0] and 15) shl 12
-            2 -> (bytes[0] and 31) shl 6
-            1 -> (bytes[0] and 127)
-            else -> throw IllegalArgumentException("Expected bytes size: 1..4, got ${bytes.size}")
-        }
-        bytes.tail().reversed().forEachIndexed { index, byte ->
-            ret = ret or (byte and 63).shl(6 * index)
-        }
-        return ret
-    }
-
-    private var surrogateLeftover = ' '
-
-    override fun read(cbuf: CharArray, off: Int, len: Int): Int {
-        var readCount = 0
-
-        when (charset) {
-            Charsets.UTF_8 -> {
-                while (readCount < len && remaining > 0) {
-                    if (surrogateLeftover != ' ') {
-                        cbuf[off + readCount] = surrogateLeftover
-
-                        readCount += 1
-                        surrogateLeftover = ' '
-                    }
-                    else {
-                        val bbuf = (0 until minOf(4L, remaining)).map { ba[readCursor + it] }
-                        val charLen = utf8GetCharLen(bbuf[0])
-                        val codePoint = utf8decode(bbuf.subList(0, charLen))
-
-                        if (codePoint < 65536) {
-                            cbuf[off + readCount] = codePoint.toChar()
-
-                            readCount += 1
-                            readCursor += charLen
-                        }
-                        else {
-                            /*
-                         * U' = yyyyyyyyyyxxxxxxxxxx  // U - 0x10000
-                         * W1 = 110110yyyyyyyyyy      // 0xD800 + yyyyyyyyyy
-                         * W2 = 110111xxxxxxxxxx      // 0xDC00 + xxxxxxxxxx
-                         */
-                            val codPoin = codePoint - 65536
-                            val surroLead = (0xD800 or codPoin.ushr(10)).toChar()
-                            val surroTrail = (0xDC00 or codPoin.and(1023)).toChar()
-
-                            cbuf[off + readCount] = surroLead
-
-                            if (off + readCount + 1 < cbuf.size) {
-                                cbuf[off + readCount + 1] = surroTrail
-
-                                readCount += 2
-                                readCursor += 4
-                            }
-                            else {
-                                readCount += 1
-                                readCursor += 4
-                                surrogateLeftover = surroTrail
-                            }
-                        }
-                    }
-                }
-            }
-            Charset.forName("CP437") -> {
-                for (i in 0 until minOf(len.toLong(), remaining)) {
-                    cbuf[(off + i).toInt()] = ba[readCursor].toChar()
-                    readCursor += 1
-                    readCount += 1
-                }
-            }
-            else -> throw UnsupportedCharsetException(charset.name())
-        }
-
-        return if (readCount == 0) -1 else readCount
-    }
-
-    override fun close() { readCursor = 0L }
-    override fun reset() { readCursor = 0L }
-    override fun markSupported() = false
-
-}
\ No newline at end of file
diff --git a/src/net/torvald/terrarum/serialise/WriteActor.kt b/src/net/torvald/terrarum/serialise/WriteActor.kt
index fe56c3b11..e9d774220 100644
--- a/src/net/torvald/terrarum/serialise/WriteActor.kt
+++ b/src/net/torvald/terrarum/serialise/WriteActor.kt
@@ -1,12 +1,8 @@
 package net.torvald.terrarum.serialise
 
-import com.badlogic.gdx.utils.Json
-import com.badlogic.gdx.utils.JsonValue
-import com.badlogic.gdx.utils.JsonWriter
 import net.torvald.terrarum.gameactors.Actor
-import net.torvald.terrarum.modulebasegame.gameactors.IngamePlayer
 import net.torvald.terrarum.modulecomputers.virtualcomputer.tvd.ByteArray64
-import java.math.BigInteger
+import net.torvald.terrarum.modulecomputers.virtualcomputer.tvd.ByteArray64Writer
 
 /**
  * Created by minjaesong on 2021-08-24.
diff --git a/src/net/torvald/terrarum/serialise/WriteMeta.kt b/src/net/torvald/terrarum/serialise/WriteMeta.kt
index 331c378f6..c2d363093 100644
--- a/src/net/torvald/terrarum/serialise/WriteMeta.kt
+++ b/src/net/torvald/terrarum/serialise/WriteMeta.kt
@@ -1,19 +1,13 @@
 package net.torvald.terrarum.serialise
 
-import com.badlogic.gdx.utils.compression.Lzma
 import net.torvald.terrarum.ModMgr
-import net.torvald.terrarum.gameactors.Actor
-import net.torvald.terrarum.gameworld.BlockLayer
+import net.torvald.terrarum.gameactors.ActorID
 import net.torvald.terrarum.modulebasegame.TerrarumIngame
 import net.torvald.terrarum.modulebasegame.worldgenerator.RoguelikeRandomiser
 import net.torvald.terrarum.modulecomputers.virtualcomputer.tvd.ByteArray64
-import net.torvald.terrarum.modulecomputers.virtualcomputer.tvd.ByteArray64GrowableOutputStream
-import net.torvald.terrarum.modulecomputers.virtualcomputer.tvd.ByteArray64InputStream
+import net.torvald.terrarum.modulecomputers.virtualcomputer.tvd.ByteArray64Reader
 import net.torvald.terrarum.weather.WeatherMixer
-import java.io.ByteArrayInputStream
 import java.io.StringReader
-import java.util.zip.GZIPInputStream
-import java.util.zip.GZIPOutputStream
 
 /**
  * Created by minjaesong on 2021-08-23.
@@ -23,51 +17,51 @@ open class WriteMeta(val ingame: TerrarumIngame) {
     open fun invoke(): String {
         val world = ingame.world
         
-        val json = """{
-"genver": ${Common.GENVER},
-"savename": "${world.worldName}",
-"terrseed": ${world.generatorSeed},
-"randseed0": ${RoguelikeRandomiser.RNG.state0},
-"randseed1": ${RoguelikeRandomiser.RNG.state1},
-"weatseed0": ${WeatherMixer.RNG.state0},
-"weatseed1": ${WeatherMixer.RNG.state1},
-"playerid": ${ingame.actorGamer.referenceID},
-"creation_t": ${world.creationTime},
-"lastplay_t": ${world.lastPlayTime},
-"playtime_t": ${world.totalPlayTime},
-"blocks": "${StringBuilder().let {
-    ModMgr.getFilesFromEveryMod("blocks/blocks.csv").forEach { (modname, file) ->
-        it.append("\n\n## module: $modname ##\n\n")
-        it.append(file.readText())
-    }
-    zipStrAndEnascii(it.toString())
-}}",
-"items": "${StringBuilder().let {
-    ModMgr.getFilesFromEveryMod("items/itemid.csv").forEach { (modname, file) ->
-        it.append("\n\n## module: $modname ##\n\n")
-        it.append(file.readText())
-    }
-    zipStrAndEnascii(it.toString())
-}}",
-"wires": "${StringBuilder().let {
-    ModMgr.getFilesFromEveryMod("wires/wires.csv").forEach { (modname, file) ->
-        it.append("\n\n## module: $modname ##\n\n")
-        it.append(file.readText())
-    }
-    zipStrAndEnascii(it.toString())
-}}",
-"materials": "${StringBuilder().let {
-    ModMgr.getFilesFromEveryMod("materials/materials.csv").forEach { (modname, file) ->
-        it.append("\n\n## module: $modname ##\n\n")
-        it.append(file.readText())
-    }
-    zipStrAndEnascii(it.toString())
-}}",
-"loadorder": [${ModMgr.loadOrder.map { "\"${it}\"" }.joinToString()}],
-"worlds": [${ingame.gameworldIndices.joinToString()}]
-}"""
-        
-        return json
+        val meta = WorldMeta(
+                genver = Common.GENVER,
+                savename = world.worldName,
+                terrseed = world.generatorSeed,
+                randseed0 = RoguelikeRandomiser.RNG.state0,
+                randseed1 = RoguelikeRandomiser.RNG.state1,
+                weatseed0 = WeatherMixer.RNG.state0,
+                weatseed1 = WeatherMixer.RNG.state1,
+                playerid = ingame.actorGamer.referenceID,
+                creation_t = world.creationTime,
+                lastplay_t = world.lastPlayTime,
+                playtime_t = world.totalPlayTime,
+                blocks = StringBuilder().let {
+                    ModMgr.getFilesFromEveryMod("blocks/blocks.csv").forEach { (modname, file) ->
+                        it.append(modnameToOrnamentalHeader(modname))
+                        it.append(file.readText())
+                    }
+                    zipStrAndEnascii(it.toString())
+                },
+                items = StringBuilder().let {
+                    ModMgr.getFilesFromEveryMod("items/itemid.csv").forEach { (modname, file) ->
+                        it.append(modnameToOrnamentalHeader(modname))
+                        it.append(file.readText())
+                    }
+                    zipStrAndEnascii(it.toString())
+                },
+                wires = StringBuilder().let {
+                    ModMgr.getFilesFromEveryMod("wires/wires.csv").forEach { (modname, file) ->
+                        it.append(modnameToOrnamentalHeader(modname))
+                        it.append(file.readText())
+                    }
+                    zipStrAndEnascii(it.toString())
+                },
+                materials = StringBuilder().let {
+                    ModMgr.getFilesFromEveryMod("materials/materials.csv").forEach { (modname, file) ->
+                        it.append(modnameToOrnamentalHeader(modname))
+                        it.append(file.readText())
+                    }
+                    zipStrAndEnascii(it.toString())
+                },
+                loadorder = ModMgr.loadOrder.toTypedArray(),
+                worlds = ingame.gameworldIndices.toTypedArray()
+        )
+
+        return Common.jsoner.toJson(meta)
     }
 
     fun encodeToByteArray64(): ByteArray64 {
@@ -77,20 +71,46 @@ open class WriteMeta(val ingame: TerrarumIngame) {
     }
 
     data class WorldMeta(
-            val genver: Int,
-            val savename: String
-    )
-
-    /**
-     * @param [s] a String
-     * @return UTF-8 encoded [s] which are GZip'd then Ascii85-encoded
-     */
-    fun zipStrAndEnascii(s: String): String {
-        return Common.bytesToZipdStr(s.toByteArray(Common.CHARSET).iterator())
+            val genver: Int = -1,
+            val savename: String = "",
+            val terrseed: Long = 0,
+            val randseed0: Long = 0,
+            val randseed1: Long = 0,
+            val weatseed0: Long = 0,
+            val weatseed1: Long = 0,
+            val playerid: ActorID = 0,
+            val creation_t: Long = 0,
+            val lastplay_t: Long = 0,
+            val playtime_t: Long = 0,
+            val blocks: String = "",
+            val items: String = "",
+            val wires: String = "",
+            val materials: String = "",
+            val loadorder: Array<String> = arrayOf(), // do not use list; Could not instantiate instance of class: java.util.Collections$SingletonList
+            val worlds: Array<Int> = arrayOf() // do not use list; Could not instantiate instance of class: java.util.Collections$SingletonList
+    ) {
+        override fun equals(other: Any?): Boolean {
+            throw UnsupportedOperationException()
+        }
     }
 
-    fun unasciiAndUnzipStr(s: String): String {
-        return ByteArray64Reader(Common.strToBytes(StringReader(s)), Common.CHARSET).readText()
+    companion object {
+        private fun modnameToOrnamentalHeader(s: String) =
+                "\n\n${"#".repeat(16 + s.length)}\n" +
+                "##  module: $s  ##\n" +
+                "${"#".repeat(16 + s.length)}\n\n"
+
+        /**
+         * @param [s] a String
+         * @return UTF-8 encoded [s] which are GZip'd then Ascii85-encoded
+         */
+        fun zipStrAndEnascii(s: String): String {
+            return Common.bytesToZipdStr(s.toByteArray(Common.CHARSET).iterator())
+        }
+
+        fun unasciiAndUnzipStr(s: String): String {
+            return ByteArray64Reader(Common.strToBytes(StringReader(s)), Common.CHARSET).readText()
+        }
     }
 }
 
diff --git a/src/net/torvald/terrarum/serialise/WriteWorld.kt b/src/net/torvald/terrarum/serialise/WriteWorld.kt
index 39bbd8842..d73a72377 100644
--- a/src/net/torvald/terrarum/serialise/WriteWorld.kt
+++ b/src/net/torvald/terrarum/serialise/WriteWorld.kt
@@ -2,9 +2,7 @@ package net.torvald.terrarum.serialise
 
 import net.torvald.terrarum.modulebasegame.TerrarumIngame
 import net.torvald.terrarum.modulecomputers.virtualcomputer.tvd.ByteArray64
-import net.torvald.terrarum.modulecomputers.virtualcomputer.tvd.ByteArray64GrowableOutputStream
-import net.torvald.terrarum.modulecomputers.virtualcomputer.tvd.ByteArray64OutputStream
-import java.io.Writer
+import net.torvald.terrarum.modulecomputers.virtualcomputer.tvd.ByteArray64Writer
 
 /**
  * Created by minjaesong on 2021-08-23.