diff --git a/src/net/torvald/terrarum/TooltipManager.kt b/src/net/torvald/terrarum/TooltipManager.kt
new file mode 100644
index 000000000..a70cb4618
--- /dev/null
+++ b/src/net/torvald/terrarum/TooltipManager.kt
@@ -0,0 +1,47 @@
+package net.torvald.terrarum
+
+/**
+ * Created by minjaesong on 2024-10-11.
+ */
+object TooltipManager {
+
+    /**
+     * Special hash values:
+     * - 10001: Encumbrance bar
+     * - 10002: Pickaxe
+     */
+    val tooltipShowing = HashMap<Long, Boolean>()
+}
+
+/**
+ * Tooltip works like a "bus" principle: you acquire the control on the tooltip-bus to show a tooltip; you
+ * release the control to the bus to hide it. `unsetToolTip()` will release the bus and forcibly closes
+ * the tooltip UI.
+ *
+ * Created by minjaesong on 2024-10-11.
+ */
+abstract class TooltipListener {
+
+    open val tooltipHash = System.nanoTime()
+
+    fun acquireTooltip(message: String?) {
+        INGAME.setTooltipMessage(message)
+        TooltipManager.tooltipShowing[tooltipHash] = true
+    }
+
+    fun releaseTooltip() {
+//        TooltipManager.tooltipShowing[tooltipHash] = false // I doubt this is not really necessary...?
+        TooltipManager.tooltipShowing.remove(tooltipHash)
+    }
+
+    fun removeFromTooltipRecord() {
+        TooltipManager.tooltipShowing.remove(tooltipHash)
+    }
+
+    fun clearTooltip() {
+        TooltipManager.tooltipShowing.clear()
+        INGAME.setTooltipMessage(null)
+    }
+
+    fun tooltipAcquired() = TooltipManager.tooltipShowing[tooltipHash] ?: false
+}
\ No newline at end of file
diff --git a/src/net/torvald/terrarum/gameactors/Actor.kt b/src/net/torvald/terrarum/gameactors/Actor.kt
index b0de544b2..b01ebc715 100644
--- a/src/net/torvald/terrarum/gameactors/Actor.kt
+++ b/src/net/torvald/terrarum/gameactors/Actor.kt
@@ -6,6 +6,7 @@ import net.torvald.terrarum.App.printdbg
 import net.torvald.terrarum.App.printdbgerr
 import net.torvald.terrarum.INGAME
 import net.torvald.terrarum.Terrarum
+import net.torvald.terrarum.TooltipListener
 import net.torvald.terrarum.audio.AudioBank
 import net.torvald.terrarum.audio.audiobank.MusicContainer
 import net.torvald.terrarum.audio.TerrarumAudioMixerTrack
@@ -27,7 +28,7 @@ typealias ActorID = Int
  *
  * Created by minjaesong on 2015-12-31.
  */
-abstract class Actor : Comparable<Actor>, Runnable {
+abstract class Actor(): TooltipListener(), Comparable<Actor>, Runnable {
 
     /**
      * Valid RefID is equal to or greater than 16777216.
@@ -42,7 +43,6 @@ abstract class Actor : Comparable<Actor>, Runnable {
      */
     var renderOrder = RenderOrder.MIDDLE
 
-    protected constructor()
 
     // needs zero-arg constructor for serialiser to work
     constructor(renderOrder: RenderOrder, id: ActorID?) : this() {
diff --git a/src/net/torvald/terrarum/gameactors/ActorWithBody.kt b/src/net/torvald/terrarum/gameactors/ActorWithBody.kt
index 5dba3b23c..53204f1c7 100644
--- a/src/net/torvald/terrarum/gameactors/ActorWithBody.kt
+++ b/src/net/torvald/terrarum/gameactors/ActorWithBody.kt
@@ -23,7 +23,6 @@ import net.torvald.terrarum.modulebasegame.TerrarumIngame
 import net.torvald.terrarum.modulebasegame.gameactors.ActorHumanoid
 import net.torvald.terrarum.modulebasegame.gameactors.IngamePlayer
 import net.torvald.terrarum.modulebasegame.gameactors.Pocketed
-import net.torvald.terrarum.modulebasegame.ui.UIItemInventoryCellCommonRes.tooltipShowing
 import net.torvald.terrarum.realestate.LandUtil
 import net.torvald.terrarum.worlddrawer.CreateTileAtlas
 import net.torvald.terrarum.worlddrawer.WorldCamera
@@ -98,8 +97,6 @@ open class ActorWithBody : Actor {
     val mouseUp: Boolean
         get() = hitbox.containsPoint((world?.width ?: 0) * TILE_SIZED, Terrarum.mouseX, Terrarum.mouseY)
 
-    @Transient protected val tooltipHash = System.nanoTime()
-
     var hitboxTranslateX: Int = 0// relative to spritePosX
     protected set
     var hitboxTranslateY: Int = 0// relative to spritePosY
@@ -702,14 +699,13 @@ open class ActorWithBody : Actor {
                     else submergedHeight / hitbox.height
 
 
-            if (mouseUp && tooltipText != null && tooltipShowing[tooltipHash] != true) {
-                INGAME.setTooltipMessage(tooltipText)
-                tooltipShowing[tooltipHash] = true
+            if (mouseUp && tooltipText != null && !tooltipAcquired()) {
+                acquireTooltip(tooltipText)
             }
         }
 
         if (tooltipText == null || !mouseUp || flagDespawn) {
-            tooltipShowing[tooltipHash] = false
+            releaseTooltip()
         }
 
 //        isStationary = (hitbox - oldHitbox).magnitudeSquared < PHYS_EPSILON_VELO
@@ -1980,7 +1976,7 @@ open class ActorWithBody : Actor {
 
     internal open fun flagDespawn() {
         flagDespawn = true
-        tooltipShowing.remove(tooltipHash)
+        removeFromTooltipRecord()
     }
 
     open fun getSpriteHead(): TextureRegion? {
@@ -2316,7 +2312,7 @@ open class ActorWithBody : Actor {
         App.disposables.add(sprite)
         App.disposables.add(spriteGlow)
         App.disposables.add(spriteEmissive)
-        tooltipShowing.remove(tooltipHash)
+        removeFromTooltipRecord()
     }
 }
 
diff --git a/src/net/torvald/terrarum/gameitems/GameItem.kt b/src/net/torvald/terrarum/gameitems/GameItem.kt
index f1665e8c8..9ccfd36b4 100644
--- a/src/net/torvald/terrarum/gameitems/GameItem.kt
+++ b/src/net/torvald/terrarum/gameitems/GameItem.kt
@@ -27,7 +27,7 @@ typealias ItemID = String
  *
  * Created by minjaesong on 2016-01-16.
  */
-abstract class GameItem(val originalID: ItemID) : Comparable<GameItem>, Cloneable, TaggedProp {
+abstract class GameItem(val originalID: ItemID) : TooltipListener(), Comparable<GameItem>, Cloneable, TaggedProp {
 
     constructor() : this("-uninitialised-")
 
diff --git a/src/net/torvald/terrarum/modulebasegame/gameactors/FixtureInductionMotor.kt b/src/net/torvald/terrarum/modulebasegame/gameactors/FixtureInductionMotor.kt
index 474b22d5f..b581980d8 100644
--- a/src/net/torvald/terrarum/modulebasegame/gameactors/FixtureInductionMotor.kt
+++ b/src/net/torvald/terrarum/modulebasegame/gameactors/FixtureInductionMotor.kt
@@ -1,23 +1,16 @@
 package net.torvald.terrarum.modulebasegame.gameactors
 
-import com.badlogic.gdx.graphics.g2d.SpriteBatch
 import net.torvald.spriteanimation.SheetSpriteAnimation
-import net.torvald.terrarum.App
-import net.torvald.terrarum.INGAME
 import net.torvald.terrarum.Point2i
 import net.torvald.terrarum.TerrarumAppConfiguration.TILE_SIZE
 import net.torvald.terrarum.TerrarumAppConfiguration.TILE_SIZED
 import net.torvald.terrarum.gameactors.AVKey
-import net.torvald.terrarum.gameworld.fmod
 import net.torvald.terrarum.langpack.Lang
 import net.torvald.terrarum.modulebasegame.gameactors.FixtureInductionMotor.Companion.MASS
 import net.torvald.terrarum.modulebasegame.gameitems.FixtureItemBase
-import net.torvald.terrarum.modulebasegame.ui.UIItemInventoryCellCommonRes.tooltipShowing
-import net.torvald.terrarum.toInt
 import net.torvald.terrarumsansbitmap.gdx.TextureRegionPack
 import org.dyn4j.geometry.Vector2
 import kotlin.math.absoluteValue
-import kotlin.math.roundToLong
 
 /**
  * Created by minjaesong on 2024-10-03.
@@ -59,10 +52,6 @@ class FixtureInductionMotor : Electric {
         setWireEmissionAt(2, 0, Vector2(16.0, 1024.0)) // speed and torque
     }
 
-    override fun dispose() {
-        tooltipShowing.remove(tooltipHash)
-    }
-
     companion object {
         const val MASS = 20.0
     }
@@ -187,10 +176,6 @@ class FixtureGearbox : Electric, Reorientable {
         }
     }
 
-    override fun dispose() {
-        tooltipShowing.remove(tooltipHash)
-    }
-
     companion object {
         @Transient val posVecsIn = listOf(
 //            Point2i(1, 0),
diff --git a/src/net/torvald/terrarum/modulebasegame/gameactors/FixtureLogicSignalEmitter.kt b/src/net/torvald/terrarum/modulebasegame/gameactors/FixtureLogicSignalEmitter.kt
index 60c52a894..32832ff49 100644
--- a/src/net/torvald/terrarum/modulebasegame/gameactors/FixtureLogicSignalEmitter.kt
+++ b/src/net/torvald/terrarum/modulebasegame/gameactors/FixtureLogicSignalEmitter.kt
@@ -4,8 +4,6 @@ import net.torvald.terrarum.TerrarumAppConfiguration.TILE_SIZE
 import net.torvald.terrarum.gameactors.AVKey
 import net.torvald.terrarum.langpack.Lang
 import net.torvald.terrarum.modulebasegame.gameitems.FixtureItemBase
-import net.torvald.terrarum.modulebasegame.ui.UIItemInventoryCellCommonRes
-import net.torvald.terrarum.modulebasegame.ui.UIItemInventoryCellCommonRes.tooltipShowing
 import net.torvald.terrarumsansbitmap.gdx.TextureRegionPack
 import org.dyn4j.geometry.Vector2
 
@@ -43,7 +41,7 @@ class FixtureLogicSignalEmitter : Electric {
     }
 
     override fun dispose() {
-        tooltipShowing.remove(tooltipHash)
+        removeFromTooltipRecord()
     }
 
     companion object {
diff --git a/src/net/torvald/terrarum/modulebasegame/gameactors/FixtureTextSignCopper.kt b/src/net/torvald/terrarum/modulebasegame/gameactors/FixtureTextSignCopper.kt
index 7dc749103..37e11ab8d 100644
--- a/src/net/torvald/terrarum/modulebasegame/gameactors/FixtureTextSignCopper.kt
+++ b/src/net/torvald/terrarum/modulebasegame/gameactors/FixtureTextSignCopper.kt
@@ -17,7 +17,6 @@ import net.torvald.terrarum.gameitems.ItemID
 import net.torvald.terrarum.itemproperties.Item
 import net.torvald.terrarum.langpack.Lang
 import net.torvald.terrarum.modulebasegame.gameitems.ItemTextSignCopper
-import net.torvald.terrarum.modulebasegame.ui.UIItemInventoryCellCommonRes.tooltipShowing
 import net.torvald.terrarumsansbitmap.gdx.TextureRegionPack
 import net.torvald.unicode.TIMES
 import org.dyn4j.geometry.Vector2
@@ -253,7 +252,7 @@ class FixtureTextSignCopper : Electric {
     }
 
     override fun dispose() {
-        tooltipShowing.remove(tooltipHash)
+        removeFromTooltipRecord()
         sprite?.dispose()
         spriteGlow?.dispose()
         spriteEmissive?.dispose()
diff --git a/src/net/torvald/terrarum/modulebasegame/gameitems/ItemWrench.kt b/src/net/torvald/terrarum/modulebasegame/gameitems/ItemWrench.kt
index 64430a2c8..b8643ea84 100644
--- a/src/net/torvald/terrarum/modulebasegame/gameitems/ItemWrench.kt
+++ b/src/net/torvald/terrarum/modulebasegame/gameitems/ItemWrench.kt
@@ -1,31 +1,26 @@
 package net.torvald.terrarum.modulebasegame.gameitems
 
-import com.badlogic.gdx.graphics.g2d.TextureRegion
 import net.torvald.terrarum.App
 import net.torvald.terrarum.CommonResourcePool
 import net.torvald.terrarum.INGAME
-import net.torvald.terrarum.Terrarum
 import net.torvald.terrarum.TerrarumAppConfiguration.TILE_SIZED
 import net.torvald.terrarum.gameactors.ActorWithBody
-import net.torvald.terrarum.gameactors.WireActor
 import net.torvald.terrarum.gameitems.FixtureInteractionBlocked
 import net.torvald.terrarum.gameitems.GameItem
 import net.torvald.terrarum.gameitems.ItemID
 import net.torvald.terrarum.gameitems.mouseInInteractableRange
-import net.torvald.terrarum.langpack.Lang
 import net.torvald.terrarum.modulebasegame.TerrarumIngame
 import net.torvald.terrarum.modulebasegame.gameactors.DroppedItem
 import net.torvald.terrarum.modulebasegame.gameactors.Reorientable
-import net.torvald.terrarum.modulebasegame.ui.UIItemInventoryCellCommonRes.tooltipShowing
 import net.torvald.unicode.getMouseButton
 
 /**
  * Created by minjaesong on 2024-03-08.
  */
 class ItemWrench(originalID: ItemID) : GameItem(originalID), FixtureInteractionBlocked {
+    override val tooltipHash = 10003L
 
     companion object {
-        private val tooltipHash = 10003L
         private val SP = "\u3000"
         private val ML = getMouseButton(App.getConfigInt("config_mouseprimary"))
         private val MR = getMouseButton(App.getConfigInt("config_mousesecondary"))
@@ -55,17 +50,18 @@ class ItemWrench(originalID: ItemID) : GameItem(originalID), FixtureInteractionB
         q = mouseInInteractableRange(actor) { mwx, mwy, mtx, mty ->
             (INGAME as TerrarumIngame).world.getWireGraphOf(mtx, mty, "wire@basegame:256").let { cnx ->
                 if (cnx != null) {
-                    INGAME.setTooltipMessage("$ML ${Lang["GAME_ACTION_DISMANTLE"]}\n$MR ${Lang["MENU_CONTROLS_ROTATE"]}")
-                    tooltipShowing[tooltipHash] = true
+                    acquireTooltip("$ML ${Lang["GAME_ACTION_DISMANTLE"]}\n$MR ${Lang["MENU_CONTROLS_ROTATE"]}")
+
                 }
                 else {
-                    tooltipShowing[tooltipHash] = false
+                    releaseTooltip()
                 }
             }
             0L
         }
         if (q == -1L)
-            tooltipShowing[tooltipHash] = false*/
+            releaseTooltip()
+        */
     }
 
     override fun startPrimaryUse(actor: ActorWithBody, delta: Float) = mouseInInteractableRange(actor) { mwx, mwy, mtx, mty ->
diff --git a/src/net/torvald/terrarum/modulebasegame/gameitems/PickaxeGeneric.kt b/src/net/torvald/terrarum/modulebasegame/gameitems/PickaxeGeneric.kt
index 04dd934f1..39f3f310c 100644
--- a/src/net/torvald/terrarum/modulebasegame/gameitems/PickaxeGeneric.kt
+++ b/src/net/torvald/terrarum/modulebasegame/gameitems/PickaxeGeneric.kt
@@ -19,7 +19,6 @@ import net.torvald.terrarum.modulebasegame.TerrarumIngame
 import net.torvald.terrarum.modulebasegame.gameactors.DroppedItem
 import net.torvald.terrarum.modulebasegame.gameitems.PickaxeCore.BASE_MASS_AND_SIZE
 import net.torvald.terrarum.modulebasegame.gameitems.PickaxeCore.TOOL_DURABILITY_BASE
-import net.torvald.terrarum.modulebasegame.ui.UIItemInventoryCellCommonRes.tooltipShowing
 import net.torvald.terrarum.worlddrawer.CreateTileAtlas.RenderTag
 import org.dyn4j.geometry.Vector2
 import kotlin.math.roundToInt
@@ -27,8 +26,8 @@ import kotlin.math.roundToInt
 /**
  * Created by minjaesong on 2019-03-10.
  */
-object PickaxeCore {
-    private val tooltipHash = 10002L
+object PickaxeCore : TooltipListener() {
+    override val tooltipHash = 10002L
     private val soundPlayedForThisTick = HashMap<ActorWithBody, Long>()
 
     /**
@@ -237,7 +236,7 @@ object PickaxeCore {
         val overlayUIopen = (INGAME as? TerrarumIngame)?.uiBlur?.isVisible ?: false
         var tooltipSet = false
 
-        val tooltipWasShown = tooltipShowing[tooltipHash] ?: false
+        val tooltipWasShown = tooltipAcquired()
 
         mouseInInteractableRangeTools(actor, tool) {
             val tileUnderCursor = INGAME.world.getTileFromOre(mx, my).item
@@ -249,8 +248,7 @@ object PickaxeCore {
                     Lang[ItemCodex[itemForOre]!!.originalName]
                 else "???"
                 if (App.getConfigBoolean("basegame:showpickaxetooltip")) {
-                    INGAME.setTooltipMessage(tileName)
-                    tooltipShowing[tooltipHash] = true
+                    acquireTooltip(tileName)
                 }
                 tooltipSet = true
             }
@@ -269,7 +267,8 @@ object PickaxeCore {
             true // just a placeholder
         }
 
-        if (App.getConfigBoolean("basegame:showpickaxetooltip") && !tooltipSet) tooltipShowing[tooltipHash] = false
+        if (App.getConfigBoolean("basegame:showpickaxetooltip") && !tooltipSet)
+            releaseTooltip()
     }
 
     private val soundCue = MusicContainer(
diff --git a/src/net/torvald/terrarum/modulebasegame/gameitems/WireGraphDebugger.kt b/src/net/torvald/terrarum/modulebasegame/gameitems/WireGraphDebugger.kt
index 2d2de3808..f69c91d8f 100644
--- a/src/net/torvald/terrarum/modulebasegame/gameitems/WireGraphDebugger.kt
+++ b/src/net/torvald/terrarum/modulebasegame/gameitems/WireGraphDebugger.kt
@@ -13,9 +13,6 @@ import net.torvald.terrarum.modulebasegame.TerrarumIngame
 import net.torvald.terrarum.modulebasegame.ui.UIItemInventoryCellCommonRes
 
 class WireGraphDebugger(originalID: ItemID) : GameItem(originalID) {
-
-    @Transient private val tooltipHash = System.nanoTime()
-
     override var baseToolSize: Double? = PickaxeCore.BASE_MASS_AND_SIZE
     override var inventoryCategory = Category.TOOL
     override val canBeDynamic = false
@@ -65,12 +62,10 @@ class WireGraphDebugger(originalID: ItemID) : GameItem(originalID) {
         }
 
         if (sb.isNotEmpty()) {
-            UIItemInventoryCellCommonRes.tooltipShowing[tooltipHash] = true
-            (Terrarum.ingame!! as TerrarumIngame).setTooltipMessage(sb.toString())
+            acquireTooltip(sb.toString())
         }
         else {
-            UIItemInventoryCellCommonRes.tooltipShowing[tooltipHash] = false
-            (Terrarum.ingame!! as TerrarumIngame).setTooltipMessage(null)
+            releaseTooltip()
         }
     }
 
@@ -78,6 +73,6 @@ class WireGraphDebugger(originalID: ItemID) : GameItem(originalID) {
         (Terrarum.ingame!! as TerrarumIngame).selectedWireRenderClass = ""
         (Terrarum.ingame!! as TerrarumIngame).setTooltipMessage(null)
         blockMarker.hideMarker()
-        UIItemInventoryCellCommonRes.tooltipShowing.remove(tooltipHash)
+        removeFromTooltipRecord()
     }
 }
\ No newline at end of file
diff --git a/src/net/torvald/terrarum/modulebasegame/ui/UIAlloyingFurnace.kt b/src/net/torvald/terrarum/modulebasegame/ui/UIAlloyingFurnace.kt
index 7f92cd464..f2590db6f 100644
--- a/src/net/torvald/terrarum/modulebasegame/ui/UIAlloyingFurnace.kt
+++ b/src/net/torvald/terrarum/modulebasegame/ui/UIAlloyingFurnace.kt
@@ -213,9 +213,6 @@ class UIAlloyingFurnace(val smelter: FixtureAlloyingFurnace) : UICanvas(
 
         playerThings.setGetInventoryFun { INGAME.actorNowPlaying!!.inventory }
         itemListUpdate()
-
-        UIItemInventoryCellCommonRes.tooltipShowing.clear()
-        INGAME.setTooltipMessage(null)
     }
 
 
@@ -449,8 +446,6 @@ class UIAlloyingFurnace(val smelter: FixtureAlloyingFurnace) : UICanvas(
 
     override fun endClosing(delta: Float) {
         super.endClosing(delta)
-        UIItemInventoryCellCommonRes.tooltipShowing.clear()
-        INGAME.setTooltipMessage(null) // required!
     }
 
     override fun dispose() {
diff --git a/src/net/torvald/terrarum/modulebasegame/ui/UICraftingWorkbench.kt b/src/net/torvald/terrarum/modulebasegame/ui/UICraftingWorkbench.kt
index 0ebb997f6..a4bdb61b4 100644
--- a/src/net/torvald/terrarum/modulebasegame/ui/UICraftingWorkbench.kt
+++ b/src/net/torvald/terrarum/modulebasegame/ui/UICraftingWorkbench.kt
@@ -15,7 +15,6 @@ import net.torvald.terrarum.modulebasegame.gameactors.ActorInventory
 import net.torvald.terrarum.modulebasegame.gameactors.CraftingStation
 import net.torvald.terrarum.modulebasegame.gameactors.FixtureInventory
 import net.torvald.terrarum.modulebasegame.gameactors.InventoryPair
-import net.torvald.terrarum.modulebasegame.ui.UIItemInventoryCellCommonRes.tooltipShowing
 import net.torvald.terrarum.modulebasegame.ui.UIItemInventoryItemGrid.Companion.listGap
 import net.torvald.terrarum.modulebasegame.ui.UITemplateHalfInventory.Companion.INVENTORY_NAME_TEXT_GAP
 import net.torvald.terrarum.ui.*
@@ -455,9 +454,6 @@ class UICraftingWorkbench(val inventoryUI: UIInventoryFull?, val parentContainer
 
         super.show()
 
-        tooltipShowing.clear()
-        INGAME.setTooltipMessage(null)
-
         resetUI()
     }
 
@@ -518,15 +514,11 @@ class UICraftingWorkbench(val inventoryUI: UIInventoryFull?, val parentContainer
 
     override fun endOpening(delta: Float) {
         super.endOpening(delta)
-        tooltipShowing.clear()
-        INGAME.setTooltipMessage(null) // required!
     }
 
     override fun endClosing(delta: Float) {
         super.endClosing(delta)
         resetUI()
-        tooltipShowing.clear()
-        INGAME.setTooltipMessage(null) // required!
     }
 
 
diff --git a/src/net/torvald/terrarum/modulebasegame/ui/UIEngravingTextSign.kt b/src/net/torvald/terrarum/modulebasegame/ui/UIEngravingTextSign.kt
index 331658960..59e9b1dac 100644
--- a/src/net/torvald/terrarum/modulebasegame/ui/UIEngravingTextSign.kt
+++ b/src/net/torvald/terrarum/modulebasegame/ui/UIEngravingTextSign.kt
@@ -16,7 +16,6 @@ import net.torvald.terrarum.langpack.Lang
 import net.torvald.terrarum.modulebasegame.gameactors.ActorInventory
 import net.torvald.terrarum.modulebasegame.gameactors.FixtureInventory
 import net.torvald.terrarum.modulebasegame.gameitems.ItemTextSignCopper
-import net.torvald.terrarum.modulebasegame.ui.UIItemInventoryCellCommonRes.tooltipShowing
 import net.torvald.terrarum.ui.*
 import net.torvald.terrarumsansbitmap.gdx.TextureRegionPack
 import net.torvald.unicode.TIMES
@@ -215,8 +214,6 @@ class UIEngravingTextSign : UICanvas(
 
     override fun show() {
         super.show()
-        tooltipShowing.clear()
-        INGAME.setTooltipMessage(null)
         resetUI()
     }
 
@@ -286,15 +283,11 @@ class UIEngravingTextSign : UICanvas(
 
     override fun endOpening(delta: Float) {
         super.endOpening(delta)
-        tooltipShowing.clear()
-        INGAME.setTooltipMessage(null) // required!
     }
 
     override fun endClosing(delta: Float) {
         super.endClosing(delta)
         resetUI()
-        tooltipShowing.clear()
-        INGAME.setTooltipMessage(null) // required!
     }
 
 }
\ No newline at end of file
diff --git a/src/net/torvald/terrarum/modulebasegame/ui/UIInventoryCells.kt b/src/net/torvald/terrarum/modulebasegame/ui/UIInventoryCells.kt
index e3f3ec2e8..9c32d8b5b 100644
--- a/src/net/torvald/terrarum/modulebasegame/ui/UIInventoryCells.kt
+++ b/src/net/torvald/terrarum/modulebasegame/ui/UIInventoryCells.kt
@@ -6,7 +6,6 @@ import com.badlogic.gdx.graphics.OrthographicCamera
 import com.badlogic.gdx.graphics.g2d.SpriteBatch
 import net.torvald.terrarum.*
 import net.torvald.terrarum.langpack.Lang
-import net.torvald.terrarum.modulebasegame.gameactors.ActorHumanoid
 import net.torvald.terrarum.modulebasegame.gameactors.ActorInventory
 import net.torvald.terrarum.modulebasegame.gameactors.DroppedItem
 import net.torvald.terrarum.modulebasegame.gameactors.FixtureInventory
@@ -14,9 +13,7 @@ import net.torvald.terrarum.modulebasegame.ui.UIInventoryFull.Companion.CELLS_HO
 import net.torvald.terrarum.modulebasegame.ui.UIInventoryFull.Companion.CELLS_VRT
 import net.torvald.terrarum.modulebasegame.ui.UIInventoryFull.Companion.INVENTORY_CELLS_OFFSET_X
 import net.torvald.terrarum.modulebasegame.ui.UIInventoryFull.Companion.INVENTORY_CELLS_OFFSET_Y
-import net.torvald.terrarum.modulebasegame.ui.UIInventoryFull.Companion.controlHelpHeight
 import net.torvald.terrarum.modulebasegame.ui.UIInventoryFull.Companion.internalWidth
-import net.torvald.terrarum.modulebasegame.ui.UIItemInventoryCellCommonRes.tooltipShowing
 import net.torvald.terrarum.modulebasegame.ui.UIItemInventoryItemGrid.Companion.createInvCellGenericKeyDownFun
 import net.torvald.terrarum.modulebasegame.ui.UIItemInventoryItemGrid.Companion.createInvCellGenericTouchDownFun
 import net.torvald.terrarum.ui.Toolkit
@@ -77,10 +74,10 @@ internal class UIInventoryCells(
                     "${(actorInventory.capacity * 100L).toLong() / 100.0}"
 
                 INGAME.setTooltipMessage("$capaStr/${actorInventory.maxCapacityByActor}")
-                tooltipShowing[10001] = true
+                TooltipManager.tooltipShowing[10001] = true
             }
             else {
-                tooltipShowing[10001] = false
+                TooltipManager.tooltipShowing[10001] = false
             }
         }
     }
@@ -179,19 +176,6 @@ internal class UIInventoryCells(
         UIInventoryCells.drawEncumbranceBar(batch, encumbBarXPos, encumbBarYPos, encumbrancePerc, full.actor.inventory)
     }
 
-    override fun show() {
-        super.show()
-        tooltipShowing.clear()
-        INGAME.setTooltipMessage(null)
-    }
-
-
-    override fun endClosing(delta: Float) {
-        super.endClosing(delta)
-        tooltipShowing.clear()
-        INGAME.setTooltipMessage(null)
-    }
-
     override fun dispose() {
         itemList.dispose()
         equipped.dispose()
diff --git a/src/net/torvald/terrarum/modulebasegame/ui/UIInventoryEscMenu.kt b/src/net/torvald/terrarum/modulebasegame/ui/UIInventoryEscMenu.kt
index 8c2359c1c..6deb7043c 100644
--- a/src/net/torvald/terrarum/modulebasegame/ui/UIInventoryEscMenu.kt
+++ b/src/net/torvald/terrarum/modulebasegame/ui/UIInventoryEscMenu.kt
@@ -1,23 +1,15 @@
 package net.torvald.terrarum.modulebasegame.ui
 
-import com.badlogic.gdx.graphics.Camera
 import com.badlogic.gdx.graphics.Color
 import com.badlogic.gdx.graphics.OrthographicCamera
 import com.badlogic.gdx.graphics.g2d.SpriteBatch
 import net.torvald.terrarum.*
-import net.torvald.terrarum.App.printdbg
-import net.torvald.terrarum.Terrarum.getPlayerSaveFiledesc
-import net.torvald.terrarum.Terrarum.getWorldSaveFiledesc
-import net.torvald.terrarum.gameactors.AVKey
 import net.torvald.terrarum.gamecontroller.TerrarumKeyboardEvent
 import net.torvald.terrarum.langpack.Lang
 import net.torvald.terrarum.modulebasegame.TerrarumIngame
 import net.torvald.terrarum.modulebasegame.TitleScreen
-import net.torvald.terrarum.modulebasegame.gameactors.IngamePlayer
 import net.torvald.terrarum.modulebasegame.ui.UIInventoryFull.Companion.INVENTORY_CELLS_OFFSET_Y
 import net.torvald.terrarum.modulebasegame.ui.UIInventoryFull.Companion.INVENTORY_CELLS_UI_HEIGHT
-import net.torvald.terrarum.modulebasegame.serialise.WriteSavegame
-import net.torvald.terrarum.modulebasegame.ui.UIItemInventoryCellCommonRes.tooltipShowing
 import net.torvald.terrarum.serialise.WriteConfig
 import net.torvald.terrarum.ui.Toolkit
 import net.torvald.terrarum.ui.UICanvas
@@ -305,8 +297,6 @@ class UIInventoryEscMenu(val full: UIInventoryFull) : UICanvas() {
 
     override fun show() {
         super.show()
-        tooltipShowing.clear()
-        INGAME.setTooltipMessage(null)
         toInitScreen()
     }
 
@@ -379,8 +369,6 @@ class UIInventoryEscMenu(val full: UIInventoryFull) : UICanvas() {
     override fun endClosing(delta: Float) {
         super.endClosing(delta)
         screen = 0
-        tooltipShowing.clear()
-        INGAME.setTooltipMessage(null)
     }
 
     override fun hide() {
diff --git a/src/net/torvald/terrarum/modulebasegame/ui/UIInventoryFull.kt b/src/net/torvald/terrarum/modulebasegame/ui/UIInventoryFull.kt
index 851753963..0235f8c79 100644
--- a/src/net/torvald/terrarum/modulebasegame/ui/UIInventoryFull.kt
+++ b/src/net/torvald/terrarum/modulebasegame/ui/UIInventoryFull.kt
@@ -12,7 +12,6 @@ import net.torvald.terrarum.audio.dsp.Lowpass
 import net.torvald.terrarum.gameitems.GameItem
 import net.torvald.terrarum.langpack.Lang
 import net.torvald.terrarum.modulebasegame.gameactors.ActorHumanoid
-import net.torvald.terrarum.modulebasegame.ui.UIItemInventoryCellCommonRes.tooltipShowing
 import net.torvald.terrarum.ui.*
 import net.torvald.terrarumsansbitmap.gdx.TextureRegionPack
 import net.torvald.unicode.*
@@ -327,12 +326,6 @@ class UIInventoryFull(
         it.setAsOpen()
     }
 
-    override fun show() {
-        super.show()
-        tooltipShowing.clear()
-        INGAME.setTooltipMessage(null)
-    }
-
     internal var offsetX = ((width - internalWidth) / 2).toFloat()
         private set
     internal var offsetY = ((App.scr.height - internalHeight) / 2).toFloat()
@@ -427,10 +420,6 @@ class UIInventoryFull(
         INGAME.setTooltipMessage(null) // required!
 //        MinimapComposer.revalidateAll()
 
-        tooltipShowing.clear()
-
-//        printdbg(this, "Clearing out tooltipShowing")
-
         shouldIFadeIn = null
     }
 
diff --git a/src/net/torvald/terrarum/modulebasegame/ui/UIItemInventoryCellBase.kt b/src/net/torvald/terrarum/modulebasegame/ui/UIItemInventoryCellBase.kt
index 7f8e4cd61..828860155 100644
--- a/src/net/torvald/terrarum/modulebasegame/ui/UIItemInventoryCellBase.kt
+++ b/src/net/torvald/terrarum/modulebasegame/ui/UIItemInventoryCellBase.kt
@@ -45,8 +45,6 @@ abstract class UIItemInventoryCellBase(
 
     override var suppressHaptic = false
 
-    protected val tooltipHash = System.nanoTime()
-
     /** Custom highlight rule to highlight tihs button to primary accent colour (blue by default).
      * Set to `null` to use default rule:
      *
@@ -128,13 +126,6 @@ object UIItemInventoryCellCommonRes {
         Color.WHITE,
         Toolkit.Theme.COL_CELL_FILL
     )
-
-    /**
-     * Special hash values:
-     * - 10001: Encumbrance bar
-     * - 10002: Pickaxe
-     */
-    val tooltipShowing = HashMap<Long, Boolean>() // Long: `hash` field on UIItemInventoryItemGrid
 }
 
 data class InventoryCellColourTheme(
diff --git a/src/net/torvald/terrarum/modulebasegame/ui/UIJukebox.kt b/src/net/torvald/terrarum/modulebasegame/ui/UIJukebox.kt
index 710da968b..7fd9236e7 100644
--- a/src/net/torvald/terrarum/modulebasegame/ui/UIJukebox.kt
+++ b/src/net/torvald/terrarum/modulebasegame/ui/UIJukebox.kt
@@ -5,10 +5,7 @@ import com.badlogic.gdx.graphics.g2d.SpriteBatch
 import net.torvald.terrarum.*
 import net.torvald.terrarum.gameitems.ItemID
 import net.torvald.terrarum.langpack.Lang
-import net.torvald.terrarum.modulebasegame.gameactors.FixtureInventory
 import net.torvald.terrarum.modulebasegame.gameactors.FixtureJukebox
-import net.torvald.terrarum.modulebasegame.gameitems.ItemFileRef
-import net.torvald.terrarum.modulebasegame.ui.UIItemInventoryCellCommonRes.tooltipShowing
 import net.torvald.terrarum.ui.*
 import net.torvald.terrarumsansbitmap.gdx.TextureRegionPack
 import net.torvald.unicode.getKeycapPC
@@ -77,8 +74,6 @@ class UIJukebox : UICanvas(
     override fun show() {
         super.show()
         transitionPanel.show()
-        tooltipShowing.clear()
-        INGAME.setTooltipMessage(null)
     }
 
     override fun hide() {
@@ -120,16 +115,6 @@ class UIJukebox : UICanvas(
         INGAME.setTooltipMessage(null)
     }
 
-    override fun endOpening(delta: Float) {
-        super.endOpening(delta)
-    }
-
-    override fun endClosing(delta: Float) {
-        super.endClosing(delta)
-        tooltipShowing.clear()
-        INGAME.setTooltipMessage(null) // required!
-    }
-
     override fun dispose() {
     }
 
diff --git a/src/net/torvald/terrarum/modulebasegame/ui/UISmelterBasic.kt b/src/net/torvald/terrarum/modulebasegame/ui/UISmelterBasic.kt
index 7fbc8f27c..35e6806af 100644
--- a/src/net/torvald/terrarum/modulebasegame/ui/UISmelterBasic.kt
+++ b/src/net/torvald/terrarum/modulebasegame/ui/UISmelterBasic.kt
@@ -11,7 +11,6 @@ import net.torvald.terrarum.modulebasegame.gameactors.FixtureSmelterBasic
 import net.torvald.terrarum.modulebasegame.gameactors.InventoryPair
 import net.torvald.terrarum.modulebasegame.ui.SmelterGuiEventBuilder.PRODUCT_SLOT
 import net.torvald.terrarum.modulebasegame.ui.SmelterGuiEventBuilder.SLOT_INDEX_STRIDE
-import net.torvald.terrarum.modulebasegame.ui.UIItemInventoryCellCommonRes.tooltipShowing
 import net.torvald.terrarum.ui.*
 import net.torvald.terrarum.ui.UIItemCatBar.Companion.FILTER_CAT_ALL
 import net.torvald.terrarum.ui.UIItemInventoryElemWide.Companion.UNIQUE_ITEM_HAS_NO_AMOUNT
@@ -207,9 +206,6 @@ class UISmelterBasic(val smelter: FixtureSmelterBasic) : UICanvas(
 
         playerThings.setGetInventoryFun { INGAME.actorNowPlaying!!.inventory }
         itemListUpdate()
-
-        tooltipShowing.clear()
-        INGAME.setTooltipMessage(null)
     }
 
     override fun updateImpl(delta: Float) {
@@ -436,8 +432,7 @@ class UISmelterBasic(val smelter: FixtureSmelterBasic) : UICanvas(
 
     override fun endClosing(delta: Float) {
         super.endClosing(delta)
-        tooltipShowing.clear()
-        INGAME.setTooltipMessage(null) // required!
+        clearTooltip()
     }
 
     override fun dispose() {
diff --git a/src/net/torvald/terrarum/modulebasegame/ui/UIStorageChest.kt b/src/net/torvald/terrarum/modulebasegame/ui/UIStorageChest.kt
index 3cada5921..73639edb5 100644
--- a/src/net/torvald/terrarum/modulebasegame/ui/UIStorageChest.kt
+++ b/src/net/torvald/terrarum/modulebasegame/ui/UIStorageChest.kt
@@ -4,19 +4,14 @@ import com.badlogic.gdx.graphics.Color
 import com.badlogic.gdx.graphics.OrthographicCamera
 import com.badlogic.gdx.graphics.g2d.SpriteBatch
 import net.torvald.terrarum.*
-import net.torvald.terrarum.App.printdbg
-import net.torvald.terrarum.gameactors.AVKey
 import net.torvald.terrarum.gameitems.GameItem
 import net.torvald.terrarum.langpack.Lang
 import net.torvald.terrarum.modulebasegame.gameactors.ActorInventory
 import net.torvald.terrarum.modulebasegame.gameactors.FixtureInventory
 import net.torvald.terrarum.modulebasegame.ui.UIInventoryFull.Companion.getWidthOfCells
-import net.torvald.terrarum.modulebasegame.ui.UIItemInventoryCellCommonRes.tooltipShowing
 import net.torvald.terrarum.ui.*
 import net.torvald.unicode.getKeycapPC
 import net.torvald.unicode.getMouseButton
-import kotlin.math.max
-import kotlin.math.min
 
 /**
  * Created by minjaesong on 2019-07-08.
@@ -190,9 +185,6 @@ internal class UIStorageChest : UICanvas(
         itemListPlayer.itemList.getInventory = { INGAME.actorNowPlaying!!.inventory }
 
         itemListUpdate()
-
-        tooltipShowing.clear()
-        INGAME.setTooltipMessage(null)
     }
 
     private fun itemListUpdate() {
@@ -313,17 +305,6 @@ internal class UIStorageChest : UICanvas(
         INGAME.setTooltipMessage(null)
     }
 
-    override fun endOpening(delta: Float) {
-        super.endOpening(delta)
-    }
-
-    override fun endClosing(delta: Float) {
-        super.endClosing(delta)
-        tooltipShowing.clear()
-        INGAME.setTooltipMessage(null) // required!
-    }
-
-
     override fun dispose() {
     }
 }
\ No newline at end of file
diff --git a/src/net/torvald/terrarum/modulebasegame/ui/UITooltip.kt b/src/net/torvald/terrarum/modulebasegame/ui/UITooltip.kt
index aff532b5e..6e48d50aa 100644
--- a/src/net/torvald/terrarum/modulebasegame/ui/UITooltip.kt
+++ b/src/net/torvald/terrarum/modulebasegame/ui/UITooltip.kt
@@ -1,15 +1,9 @@
 package net.torvald.terrarum.modulebasegame.ui
 
-import com.badlogic.gdx.graphics.Camera
 import com.badlogic.gdx.graphics.Color
 import com.badlogic.gdx.graphics.OrthographicCamera
 import com.badlogic.gdx.graphics.g2d.SpriteBatch
-import net.torvald.terrarum.App
-import net.torvald.terrarum.App.printdbg
-import net.torvald.terrarum.INGAME
-import net.torvald.terrarum.Second
-import net.torvald.terrarum.Terrarum
-import net.torvald.terrarum.modulebasegame.ui.UIItemInventoryCellCommonRes.tooltipShowing
+import net.torvald.terrarum.*
 import net.torvald.terrarum.ui.Toolkit
 import net.torvald.terrarum.ui.UICanvas
 import net.torvald.terrarum.ui.UINotControllable
@@ -105,11 +99,34 @@ class UITooltip : UICanvas() {
     override fun updateImpl(delta: Float) {
         setPosition(Terrarum.mouseScreenX, Terrarum.mouseScreenY)
 
-        if (isVisible && tooltipShowing.values.all { !it }) {
+        if (isVisible && (TooltipManager.tooltipShowing.isEmpty() || TooltipManager.tooltipShowing.values.all { !it })) {
             INGAME.setTooltipMessage(null)
         }
     }
 
+    override fun endOpening(delta: Float) {
+        handler.opacity = 1f
+        // Tooltip must not acquire control of itself
+    }
+
+    override fun endClosing(delta: Float) {
+        handler.opacity = 0f
+        // Tooltip must not acquire control of itself
+    }
+
+    override fun show() {
+        openingClickLatched = true
+        // Tooltip must not acquire control of itself
+        uiItems.forEach { it.show() }
+        handler.subUIs.forEach { it.show() }
+    }
+
+    override fun hide() {
+        uiItems.forEach { it.hide() }
+        handler.subUIs.forEach { it.hide() }
+        openingClickLatched = true // just in case `justOpened` detection fails
+    }
+
     override fun dispose() {
     }
 
diff --git a/src/net/torvald/terrarum/modulebasegame/ui/UIWallCalendar.kt b/src/net/torvald/terrarum/modulebasegame/ui/UIWallCalendar.kt
index 36192791a..19aed4773 100644
--- a/src/net/torvald/terrarum/modulebasegame/ui/UIWallCalendar.kt
+++ b/src/net/torvald/terrarum/modulebasegame/ui/UIWallCalendar.kt
@@ -1,6 +1,5 @@
 package net.torvald.terrarum.modulebasegame.ui
 
-import com.badlogic.gdx.graphics.Camera
 import com.badlogic.gdx.graphics.Color
 import com.badlogic.gdx.graphics.OrthographicCamera
 import com.badlogic.gdx.graphics.g2d.SpriteBatch
@@ -8,7 +7,6 @@ import net.torvald.terrarum.*
 import net.torvald.terrarum.gameworld.WorldTime
 import net.torvald.terrarum.gameworld.WorldTime.Companion.MONTH_LENGTH
 import net.torvald.terrarum.langpack.Lang
-import net.torvald.terrarum.modulebasegame.ui.UIItemInventoryCellCommonRes.tooltipShowing
 import net.torvald.terrarum.ui.Toolkit
 import net.torvald.terrarum.ui.UICanvas
 import net.torvald.unicode.getKeycapPC
@@ -358,25 +356,11 @@ class UIWallCalendar : UICanvas(
     override fun doOpening(delta: Float) {
         super.doOpening(delta)
         INGAME.pause()
-        INGAME.setTooltipMessage(null)
     }
 
     override fun doClosing(delta: Float) {
         super.doClosing(delta)
         INGAME.resume()
-        INGAME.setTooltipMessage(null)
-    }
-
-    override fun endOpening(delta: Float) {
-        super.endOpening(delta)
-        tooltipShowing.clear()
-        INGAME.setTooltipMessage(null) // required!
-    }
-
-    override fun endClosing(delta: Float) {
-        super.endClosing(delta)
-        tooltipShowing.clear()
-        INGAME.setTooltipMessage(null) // required!
     }
 
     override fun dispose() {
diff --git a/src/net/torvald/terrarum/modulebasegame/ui/UIWorldPortal.kt b/src/net/torvald/terrarum/modulebasegame/ui/UIWorldPortal.kt
index d37131a5a..312bfe3a5 100644
--- a/src/net/torvald/terrarum/modulebasegame/ui/UIWorldPortal.kt
+++ b/src/net/torvald/terrarum/modulebasegame/ui/UIWorldPortal.kt
@@ -1,12 +1,10 @@
 package net.torvald.terrarum.modulebasegame.ui
 
-import com.badlogic.gdx.graphics.Camera
 import com.badlogic.gdx.graphics.OrthographicCamera
 import com.badlogic.gdx.graphics.g2d.SpriteBatch
 import com.jme3.math.FastMath
 import net.torvald.terrarum.*
 import net.torvald.terrarum.gameactors.AVKey
-import net.torvald.terrarum.gamecontroller.TerrarumKeyboardEvent
 import net.torvald.terrarum.langpack.Lang
 import net.torvald.terrarum.modulebasegame.gameactors.FixtureWorldPortal
 import net.torvald.terrarum.modulebasegame.ui.UIInventoryFull.Companion.INVENTORY_CELLS_OFFSET_Y
@@ -14,12 +12,11 @@ import net.torvald.terrarum.modulebasegame.ui.UIInventoryFull.Companion.YPOS_COR
 import net.torvald.terrarum.modulebasegame.ui.UIInventoryFull.Companion.drawBackground
 import net.torvald.terrarum.modulebasegame.ui.UIInventoryFull.Companion.internalHeight
 import net.torvald.terrarum.modulebasegame.ui.UIInventoryFull.Companion.internalWidth
-import net.torvald.terrarum.modulebasegame.ui.UIItemInventoryCellCommonRes.tooltipShowing
 import net.torvald.terrarum.serialise.toAscii85
 import net.torvald.terrarum.ui.*
 import net.torvald.terrarumsansbitmap.gdx.TextureRegionPack
 import net.torvald.unicode.getKeycapPC
-import java.util.UUID
+import java.util.*
 
 /**
  * Structure:
@@ -186,15 +183,11 @@ class UIWorldPortal : UICanvas(
     override fun endOpening(delta: Float) {
         super.endOpening(delta)
         transitionPanel.uis.forEach { it.opacity = FastMath.pow(opacity, 0.5f)  }
-        tooltipShowing.clear()
-        INGAME.setTooltipMessage(null) // required!
     }
 
     override fun endClosing(delta: Float) {
         super.endClosing(delta)
         transitionPanel.uis.forEach { it.opacity = FastMath.pow(opacity, 0.5f) }
-        tooltipShowing.clear()
-        INGAME.setTooltipMessage(null) // required!
     }
 }
 
diff --git a/src/net/torvald/terrarum/modulebasegame/ui/UIWorldPortalCargo.kt b/src/net/torvald/terrarum/modulebasegame/ui/UIWorldPortalCargo.kt
index 0fac61ea2..f77f332cc 100644
--- a/src/net/torvald/terrarum/modulebasegame/ui/UIWorldPortalCargo.kt
+++ b/src/net/torvald/terrarum/modulebasegame/ui/UIWorldPortalCargo.kt
@@ -9,11 +9,8 @@ import net.torvald.terrarum.gameitems.GameItem
 import net.torvald.terrarum.langpack.Lang
 import net.torvald.terrarum.modulebasegame.gameactors.ActorInventory
 import net.torvald.terrarum.modulebasegame.gameactors.FixtureInventory
-import net.torvald.terrarum.modulebasegame.ui.UIItemInventoryCellCommonRes.tooltipShowing
 import net.torvald.terrarum.ui.*
 import net.torvald.unicode.getKeycapPC
-import kotlin.math.max
-import kotlin.math.min
 
 class UIWorldPortalCargo(val full: UIWorldPortal) : UICanvas(), HasInventory {
 
@@ -145,9 +142,6 @@ class UIWorldPortalCargo(val full: UIWorldPortal) : UICanvas(), HasInventory {
         itemListPlayer.getInventory = { INGAME.actorNowPlaying!!.inventory }
 
         itemListUpdate()
-
-        tooltipShowing.clear()
-        INGAME.setTooltipMessage(null)
     }
 
     private fun itemListUpdate() {
@@ -242,8 +236,6 @@ class UIWorldPortalCargo(val full: UIWorldPortal) : UICanvas(), HasInventory {
     }
 
     override fun endClosing(delta: Float) {
-        tooltipShowing.clear()
-        INGAME.setTooltipMessage(null) // required!
     }
 
 
diff --git a/src/net/torvald/terrarum/modulebasegame/ui/UIWorldPortalListing.kt b/src/net/torvald/terrarum/modulebasegame/ui/UIWorldPortalListing.kt
index 3756f02e6..ece772b0f 100644
--- a/src/net/torvald/terrarum/modulebasegame/ui/UIWorldPortalListing.kt
+++ b/src/net/torvald/terrarum/modulebasegame/ui/UIWorldPortalListing.kt
@@ -13,7 +13,6 @@ import net.torvald.terrarum.langpack.Lang
 import net.torvald.terrarum.modulebasegame.gameactors.FixtureWorldPortal
 import net.torvald.terrarum.modulebasegame.ui.UIInventoryFull.Companion.INVENTORY_CELLS_OFFSET_Y
 import net.torvald.terrarum.modulebasegame.ui.UIInventoryFull.Companion.getCellCountVertically
-import net.torvald.terrarum.modulebasegame.ui.UIItemInventoryCellCommonRes.tooltipShowing
 import net.torvald.terrarum.realestate.LandUtil.CHUNK_H
 import net.torvald.terrarum.realestate.LandUtil.CHUNK_W
 import net.torvald.terrarum.savegame.*
@@ -521,16 +520,6 @@ class UIWorldPortalListing(val full: UIWorldPortal) : UICanvas() {
         INGAME.setTooltipMessage(null)
     }
 
-    override fun endOpening(delta: Float) {
-        super.endOpening(delta)
-    }
-
-    override fun endClosing(delta: Float) {
-        super.endClosing(delta)
-        tooltipShowing.clear()
-        INGAME.setTooltipMessage(null) // required!
-    }
-
 }
 
 
diff --git a/src/net/torvald/terrarum/ui/UICanvas.kt b/src/net/torvald/terrarum/ui/UICanvas.kt
index 95b23d3e0..2a0efb14c 100644
--- a/src/net/torvald/terrarum/ui/UICanvas.kt
+++ b/src/net/torvald/terrarum/ui/UICanvas.kt
@@ -6,6 +6,7 @@ import com.badlogic.gdx.utils.Disposable
 import net.torvald.terrarum.App
 import net.torvald.terrarum.Second
 import net.torvald.terrarum.Terrarum
+import net.torvald.terrarum.TooltipListener
 import net.torvald.terrarum.gamecontroller.TerrarumKeyboardEvent
 import kotlin.math.max
 import kotlin.math.roundToInt
@@ -63,7 +64,7 @@ abstract class UICanvas(
         // UI positions itself? (you must g.flush() yourself after the g.translate(Int, Int))
         customPositioning: Boolean = false, // mainly used by vital meter
         doNotWarnConstant: Boolean = false
-): Disposable {
+): TooltipListener(), Disposable {
 
     internal var openingClickLatched = false
 
@@ -136,6 +137,7 @@ abstract class UICanvas(
     /** A function that is run ONCE when the UI is requested to be opened; will work identical to [endOpening] if [openCloseTime] is zero */
     open fun show() {
         openingClickLatched = true
+        clearTooltip()
         uiItems.forEach { it.show() }
         handler.subUIs.forEach { it.show() }
     }
@@ -183,6 +185,7 @@ abstract class UICanvas(
      */
     open fun endOpening(delta: Float) {
         handler.opacity = 1f
+        clearTooltip()
     }
 
     /**
@@ -190,6 +193,7 @@ abstract class UICanvas(
      */
     open fun endClosing(delta: Float) {
         handler.opacity = 0f
+        clearTooltip()
     }
 
     abstract override fun dispose()
diff --git a/src/net/torvald/terrarum/ui/UIItemInventoryElemSimple.kt b/src/net/torvald/terrarum/ui/UIItemInventoryElemSimple.kt
index 1630b05b3..d4cecd289 100644
--- a/src/net/torvald/terrarum/ui/UIItemInventoryElemSimple.kt
+++ b/src/net/torvald/terrarum/ui/UIItemInventoryElemSimple.kt
@@ -14,7 +14,6 @@ import net.torvald.terrarum.modulebasegame.ui.UIItemInventoryCellBase
 import net.torvald.terrarum.modulebasegame.ui.UIItemInventoryCellCommonRes
 import net.torvald.terrarum.modulebasegame.ui.UIItemInventoryCellCommonRes.defaultInventoryCellTheme
 import net.torvald.terrarum.modulebasegame.ui.UIItemInventoryCellCommonRes.toItemCountText
-import net.torvald.terrarum.modulebasegame.ui.UIItemInventoryCellCommonRes.tooltipShowing
 import kotlin.math.roundToInt
 
 /**
@@ -131,7 +130,7 @@ class UIItemInventoryElemSimple(
 
 
             // set tooltip accordingly
-            if (tooltipShowing[tooltipHash] != true && mouseUp) {
+            if (!tooltipAcquired() && mouseUp) {
 //                printdbg(this, "calling INGAME.setTooltipMessage by $hash")
 
                 val grey = App.fontGame.toColorCode(11, 11, 11)
@@ -142,10 +141,7 @@ class UIItemInventoryElemSimple(
 
                 val finalStr = if (descStr != null) "$nameStr\n$grey$descStr" else nameStr
 
-                INGAME.setTooltipMessage(finalStr)
-
-                tooltipShowing[tooltipHash] = true
-//                printdbg(this, tooltipShowing.entries)
+                acquireTooltip(finalStr)
             }
         }
         else {
@@ -159,7 +155,7 @@ class UIItemInventoryElemSimple(
         }
 
         if (item == null || !mouseUp) {
-            tooltipShowing[tooltipHash] = false
+            releaseTooltip()
         }
 
         // see IFs above?
@@ -168,10 +164,10 @@ class UIItemInventoryElemSimple(
     }
 
     override fun dispose() {
-        tooltipShowing.remove(tooltipHash)
+        removeFromTooltipRecord()
     }
 
     override fun hide() {
-        tooltipShowing.remove(tooltipHash)
+        removeFromTooltipRecord()
     }
 }
\ No newline at end of file
diff --git a/src/net/torvald/terrarum/ui/UIItemInventoryElemWide.kt b/src/net/torvald/terrarum/ui/UIItemInventoryElemWide.kt
index 7f79fd185..8fa241e38 100644
--- a/src/net/torvald/terrarum/ui/UIItemInventoryElemWide.kt
+++ b/src/net/torvald/terrarum/ui/UIItemInventoryElemWide.kt
@@ -13,7 +13,6 @@ import net.torvald.terrarum.modulebasegame.ui.InventoryCellColourTheme
 import net.torvald.terrarum.modulebasegame.ui.UIItemInventoryCellBase
 import net.torvald.terrarum.modulebasegame.ui.UIItemInventoryCellCommonRes
 import net.torvald.terrarum.modulebasegame.ui.UIItemInventoryCellCommonRes.toItemCountText
-import net.torvald.terrarum.modulebasegame.ui.UIItemInventoryCellCommonRes.tooltipShowing
 import kotlin.math.roundToInt
 
 /***
@@ -159,7 +158,7 @@ class UIItemInventoryElemWide(
 
 
             // set tooltip accordingly
-            if (tooltipShowing[tooltipHash] != true && item != null && mouseUp) {
+            if (!tooltipAcquired() && item != null && mouseUp) {
 //                printdbg(this, "calling INGAME.setTooltipMessage by $hash")
 
                 val grey = App.fontGame.toColorCode(11, 11, 11)
@@ -170,15 +169,12 @@ class UIItemInventoryElemWide(
 
                 val finalStr = if (descStr != null) "$nameStr\n$grey$descStr" else nameStr
 
-                INGAME.setTooltipMessage(finalStr)
-
-                tooltipShowing[tooltipHash] = true
-//                printdbg(this, tooltipShowing.entries)
+                acquireTooltip(finalStr)
             }
         }
 
         if (item == null || !mouseUp) {
-            tooltipShowing[tooltipHash] = false
+            releaseTooltip()
         }
 
         // see IFs above?
@@ -186,10 +182,10 @@ class UIItemInventoryElemWide(
     }
 
     override fun dispose() {
-        tooltipShowing.remove(tooltipHash)
+        removeFromTooltipRecord()
     }
 
     override fun hide() {
-        tooltipShowing.remove(tooltipHash)
+        removeFromTooltipRecord()
     }
 }
diff --git a/src/net/torvald/terrarum/ui/UITemplate.kt b/src/net/torvald/terrarum/ui/UITemplate.kt
index 5899698a8..7b868a1d0 100644
--- a/src/net/torvald/terrarum/ui/UITemplate.kt
+++ b/src/net/torvald/terrarum/ui/UITemplate.kt
@@ -3,6 +3,7 @@ package net.torvald.terrarum.ui
 import com.badlogic.gdx.graphics.OrthographicCamera
 import com.badlogic.gdx.graphics.g2d.SpriteBatch
 import com.badlogic.gdx.utils.Disposable
+import net.torvald.terrarum.TooltipListener
 import net.torvald.terrarum.gamecontroller.TerrarumKeyboardEvent
 
 /**
@@ -28,7 +29,7 @@ abstract class UITemplate(val parent: UICanvas) : UIItemisable() {
 /**
  * Created by minjaesong on 2024-01-29.
  */
-abstract class UIItemisable : Disposable {
+abstract class UIItemisable : TooltipListener(), Disposable {
     abstract fun update(delta: Float)
     abstract fun render(frameDelta: Float, batch: SpriteBatch, camera: OrthographicCamera)
     open fun show() {}