diff --git a/ClassicalSharp/Blocks/BlockInfo.cs b/ClassicalSharp/Blocks/BlockInfo.cs
index 42a0b51f5..492c2027e 100644
--- a/ClassicalSharp/Blocks/BlockInfo.cs
+++ b/ClassicalSharp/Blocks/BlockInfo.cs
@@ -61,6 +61,8 @@ namespace ClassicalSharp {
 
 		/// <summary> Lava style 'swimming'/'bobbing' interaction when player collides. </summary>
 		public const byte LiquidLava = 6;
+		
+		public const byte ClimbRope = 7;
 	}
 	
 	/// <summary> Stores various properties about the blocks. </summary>
diff --git a/ClassicalSharp/Blocks/DefaultSet.cs b/ClassicalSharp/Blocks/DefaultSet.cs
index 80c2656bf..e5a801f6d 100644
--- a/ClassicalSharp/Blocks/DefaultSet.cs
+++ b/ClassicalSharp/Blocks/DefaultSet.cs
@@ -54,6 +54,8 @@ namespace ClassicalSharp.Blocks {
 		}
 		
 		public static byte MapOldCollide(BlockID b, byte collide) {
+			if (b == Block.Rope && collide == CollideType.Gas)
+				return CollideType.ClimbRope;
 			if (b == Block.Ice && collide == CollideType.Solid) 
 				return CollideType.Ice;
 			if ((b == Block.Water || b == Block.StillWater) && collide == CollideType.Liquid)
diff --git a/ClassicalSharp/Entities/Entity.cs b/ClassicalSharp/Entities/Entity.cs
index 444a6de4a..1c01207f5 100644
--- a/ClassicalSharp/Entities/Entity.cs
+++ b/ClassicalSharp/Entities/Entity.cs
@@ -214,7 +214,7 @@ namespace ClassicalSharp.Entities {
 			return TouchesAny(bounds, touchesRope);
 		}
 		static Predicate<BlockID> touchesRope = IsRope;
-		static bool IsRope(BlockID b) { return b == Block.Rope; }
+		static bool IsRope(BlockID b) { return BlockInfo.ExtendedCollide[b] == CollideType.ClimbRope; }
 	
 		
 		static readonly Vector3 liqExpand = new Vector3(0.25f/16f, 0/16f, 0.25f/16f);
diff --git a/ClassicalSharp/Singleplayer/LiquidPhysics.cs b/ClassicalSharp/Singleplayer/LiquidPhysics.cs
index 7e016ecab..7b5b65723 100644
--- a/ClassicalSharp/Singleplayer/LiquidPhysics.cs
+++ b/ClassicalSharp/Singleplayer/LiquidPhysics.cs
@@ -138,7 +138,7 @@ namespace ClassicalSharp.Singleplayer {
 			BlockID block = map.blocks[posIndex];
 			if (block == Block.Lava || block == Block.StillLava) {
 				game.UpdateBlock(x, y, z, Block.Stone);
-			} else if (BlockInfo.Collide[block] == CollideType.Gas && block != Block.Rope) {
+			} else if (BlockInfo.ExtendedCollide[block] == CollideType.Gas) {
 				// Sponge check
 				for (int yy = (y < 2 ? 0 : y - 2); yy <= (y > maxWaterY ? maxY : y + 2); yy++)
 					for (int zz = (z < 2 ? 0 : z - 2); zz <= (z > maxWaterZ ? maxZ : z + 2); zz++)
diff --git a/src/Client/Block.c b/src/Client/Block.c
index 1bc1b0d8b..8d4389342 100644
--- a/src/Client/Block.c
+++ b/src/Client/Block.c
@@ -616,6 +616,8 @@ UInt8 DefaultSet_Collide(BlockID b) {
 }
 
 UInt8 DefaultSet_MapOldCollide(BlockID b, UInt8 collide) {
+	if (b == BLOCK_ROPE && collide == COLLIDE_GAS)
+		return COLLIDE_CLIMB_ROPE;
 	if (b == BLOCK_ICE && collide == COLLIDE_SOLID)
 		return COLLIDE_ICE;
 	if ((b == BLOCK_WATER || b == BLOCK_STILL_WATER) && collide == COLLIDE_LIQUID)
diff --git a/src/Client/Block.h b/src/Client/Block.h
index 5f7686636..6db0c8821 100644
--- a/src/Client/Block.h
+++ b/src/Client/Block.h
@@ -39,6 +39,7 @@
 #define COLLIDE_SLIPPERY_ICE 4 /* Block is solid and fully slidable on. */
 #define COLLIDE_LIQUID_WATER 5 /* Water style 'swimming'/'bobbing' interaction when player collides. */
 #define COLLIDE_LIQUID_LAVA  6 /* Lava style 'swimming'/'bobbing' interaction when player collides. */
+#define COLLIDE_CLIMB_ROPE   7 /* Rope/Ladder style climbing interaction when player collides */
 
 UInt8 Block_NamesBuffer[String_BufferSize(STRING_SIZE) * BLOCK_COUNT];
 #define Block_NamePtr(i) &Block_NamesBuffer[String_BufferSize(STRING_SIZE) * i]
diff --git a/src/Client/Entity.c b/src/Client/Entity.c
index e4209bf9f..d0cbc8740 100644
--- a/src/Client/Entity.c
+++ b/src/Client/Entity.c
@@ -190,7 +190,7 @@ bool Entity_TouchesAny(AABB* bounds, TouchesAny_Condition condition) {
 	return false;
 }
 
-bool Entity_IsRope(BlockID b) { return b == BLOCK_ROPE; }
+bool Entity_IsRope(BlockID b) { return Block_ExtendedCollide[b] == COLLIDE_CLIMB_ROPE; }
 bool Entity_TouchesAnyRope(Entity* entity) {
 	AABB bounds; Entity_GetBounds(entity, &bounds);
 	bounds.Max.Y += 0.5f / 16.0f;