diff --git a/src/net/torvald/terrarum/gameactors/AVKey.kt b/src/net/torvald/terrarum/gameactors/AVKey.kt
index 0ecae3575..d02c4c7b1 100644
--- a/src/net/torvald/terrarum/gameactors/AVKey.kt
+++ b/src/net/torvald/terrarum/gameactors/AVKey.kt
@@ -149,4 +149,13 @@ object AVKey {
      * example value: `"SIxM+kGlrjZgLx5Zeqz7,;:UIZ5Q=2WT35SgKpOp.,vvf'fNW3G<ROimy(Y;E<,-mdtr5|^RGOqr0x*T*lC,YABr1oQwErKG)pGC'gUG"`
      */
     const val WORLD_PORTAL_DICT = "worldportaldict"
+
+    /** String
+     * Reserved values:
+     * - `survival`: future use for the basegame
+     * - empty value: creative mode for basegame
+     *
+     * This value is only used for IngamePlayers
+     */
+    const val GAMEMODE = "gamemode"
 }
\ 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 7c7db2d34..6fe6e1909 100644
--- a/src/net/torvald/terrarum/gameactors/ActorWithBody.kt
+++ b/src/net/torvald/terrarum/gameactors/ActorWithBody.kt
@@ -269,15 +269,20 @@ open class ActorWithBody : Actor {
                    accelMultMovement *
                    scale.sqrt()
         }
+    val ingamePlayersCanBeEncumbered: Boolean
+        get() = if (this is IngamePlayer)
+            !actorValue.getAsString(AVKey.GAMEMODE).isNullOrBlank()
+        else true
+
     val encumberment: Double
-        get() = if (this is Pocketed) this.inventory.encumberment else 0.0
+        get() = if (this is Pocketed && ingamePlayersCanBeEncumbered) this.inventory.encumberment else 0.0
 
     val avSpeedCap: Double
         get() = actorValue.getAsDouble(AVKey.SPEED)!! * // base stat
                 (actorValue.getAsDouble(AVKey.SPEEDBUFF) ?: 1.0) * // buffed stat
                 speedMultByTile * // tile-specific
-                scale.sqrt()  // taller actors have longer legs but also receives relatively weaker gravity -> pow(0.5)
-//                ((encumberment / avStrengthNormalised).pow(-2.0/3.0)).coerceIn(0.1, 1.0) // encumbered actors move slower
+                scale.sqrt() * // taller actors have longer legs but also receives relatively weaker gravity -> pow(0.5)
+                ((encumberment / avStrengthNormalised).pow(-2.0/3.0)).coerceIn(0.1, 1.0) // encumbered actors move slower
 
     /**
      * Flags and Properties
diff --git a/src/net/torvald/terrarum/modulebasegame/gameactors/ActorHumanoid.kt b/src/net/torvald/terrarum/modulebasegame/gameactors/ActorHumanoid.kt
index f509d268f..d1b9f42b5 100644
--- a/src/net/torvald/terrarum/modulebasegame/gameactors/ActorHumanoid.kt
+++ b/src/net/torvald/terrarum/modulebasegame/gameactors/ActorHumanoid.kt
@@ -657,7 +657,7 @@ open class ActorHumanoid : ActorWithBody, Controllable, Pocketed, Factionable, L
                 (actorValue.getAsDouble(AVKey.JUMPPOWERBUFF) ?: 1.0) * // buffed stat
                 jumpMultByTile * // tile-specific
                 scale.pow(0.25) *
-//                ((encumberment / avStrengthNormalised).pow(-1.0/3.0)).coerceIn(0.48, 1.0) // encumbered actors move slower
+                ((encumberment / avStrengthNormalised).pow(-1.0/3.0)).coerceIn(0.48, 1.0) // encumbered actors move slower
 
     private fun jumpFunc(len: Int, counter: Int): Double {
         // linear time mode