20 files changed, 431 insertions, 330 deletions

diff --git a/src/BlockID.h b/src/BlockID.h
index e5f49fe2c..9742e9745 100644
--- a/src/BlockID.h
+++ b/src/BlockID.h
@@ -174,7 +174,7 @@ enum ENUM_BLOCK_ID
 	E_BLOCK_NEW_LEAVES = 161, // Acacia and Dark Oak IDs in Minecraft 1.7.x
 	E_BLOCK_NEW_LOG = 162,
 	E_BLOCK_ACACIA_WOOD_STAIRS = 163,
-	E_BLOCK_DARK_OAK_WOOD_STAIRS = 164, /////////////////////////////////
+	E_BLOCK_DARK_OAK_WOOD_STAIRS = 164,
 	E_BLOCK_HAY_BALE = 170,
 	E_BLOCK_CARPET = 171,	
 	E_BLOCK_HARDENED_CLAY = 172,
@@ -187,8 +187,7 @@ enum ENUM_BLOCK_ID
 	E_BLOCK_NUMBER_OF_TYPES,  ///< Number of individual (different) blocktypes
 	E_BLOCK_MAX_TYPE_ID = E_BLOCK_NUMBER_OF_TYPES - 1,  ///< Maximum BlockType number used
 	
-	// Synonym or ID compatibility
-	
+	// Synonym or ID compatibility	
 	E_BLOCK_YELLOW_FLOWER = E_BLOCK_DANDELION,
 	E_BLOCK_RED_ROSE = E_BLOCK_FLOWER,
 	E_BLOCK_LOCKED_CHEST = E_BLOCK_STAINED_GLASS,
diff --git a/src/Blocks/BlockButton.cpp b/src/Blocks/BlockButton.cpp
deleted file mode 100644
index a48e82f4d..000000000
--- a/src/Blocks/BlockButton.cpp
+++ /dev/null
@@ -1,32 +0,0 @@
-
-#include "Globals.h"
-#include "BlockButton.h"
-
-
-
-
-
-cBlockButtonHandler::cBlockButtonHandler(BLOCKTYPE a_BlockType)
-	: cBlockHandler(a_BlockType)
-{
-}
-
-
-
-
-
-void cBlockButtonHandler::OnUse(cWorld *a_World, cPlayer *a_Player, int a_BlockX, int a_BlockY, int a_BlockZ, char a_BlockFace, int a_CursorX, int a_CursorY, int a_CursorZ)
-{
-	// Flip the ON bit on/off using the XOR bitwise operation
-	NIBBLETYPE Meta = (a_World->GetBlockMeta(a_BlockX, a_BlockY, a_BlockZ) | 0x08);
-	
-	a_World->SetBlock(a_BlockX, a_BlockY, a_BlockZ, m_BlockType, Meta);
-	a_World->BroadcastSoundEffect("random.click", a_BlockX * 8, a_BlockY * 8, a_BlockZ * 8, 0.5f, (Meta & 0x08) ? 0.6f : 0.5f);
-
-	// Queue a button reset (unpress)
-	a_World->QueueSetBlock(a_BlockX, a_BlockY, a_BlockZ, m_BlockType, (a_World->GetBlockMeta(a_BlockX, a_BlockY, a_BlockZ) & 0x07), m_BlockType == E_BLOCK_STONE_BUTTON ? 20 : 30);
-}
-
-
-
-
diff --git a/src/Blocks/BlockButton.h b/src/Blocks/BlockButton.h
index e2c60002b..ec897835a 100644
--- a/src/Blocks/BlockButton.h
+++ b/src/Blocks/BlockButton.h
@@ -10,9 +10,23 @@ class cBlockButtonHandler :
 	public cBlockHandler
 {
 public:
-	cBlockButtonHandler(BLOCKTYPE a_BlockType);
+	cBlockButtonHandler(BLOCKTYPE a_BlockType)
+		: cBlockHandler(a_BlockType)
+	{
+	}
+
 	
-	virtual void OnUse(cWorld * a_World, cPlayer * a_Player, int a_BlockX, int a_BlockY, int a_BlockZ, char a_BlockFace, int a_CursorX, int a_CursorY, int a_CursorZ) override;
+	virtual void OnUse(cWorld * a_World, cPlayer * a_Player, int a_BlockX, int a_BlockY, int a_BlockZ, char a_BlockFace, int a_CursorX, int a_CursorY, int a_CursorZ) override
+	{
+		// Flip the ON bit on/off using the XOR bitwise operation
+		NIBBLETYPE Meta = (a_World->GetBlockMeta(a_BlockX, a_BlockY, a_BlockZ) | 0x08);
+
+		a_World->SetBlockMeta(a_BlockX, a_BlockY, a_BlockZ, Meta);
+		a_World->BroadcastSoundEffect("random.click", a_BlockX * 8, a_BlockY * 8, a_BlockZ * 8, 0.5f, (Meta & 0x08) ? 0.6f : 0.5f);
+
+		// Queue a button reset (unpress)
+		a_World->QueueSetBlock(a_BlockX, a_BlockY, a_BlockZ, m_BlockType, (a_World->GetBlockMeta(a_BlockX, a_BlockY, a_BlockZ) & 0x07), m_BlockType == E_BLOCK_STONE_BUTTON ? 20 : 30);
+	}
 
 	
 	virtual void ConvertToPickups(cItems & a_Pickups, NIBBLETYPE a_BlockMeta) override
@@ -51,10 +65,10 @@ public:
 	{
 		switch (a_BlockFace)
 		{
-			case BLOCK_FACE_ZM: { return 0x4; }
-			case BLOCK_FACE_ZP: { return 0x3; }
-			case BLOCK_FACE_XM: { return 0x2; }
-			case BLOCK_FACE_XP: { return 0x1; }
+			case BLOCK_FACE_ZM: return 0x4;
+			case BLOCK_FACE_ZP: return 0x3;
+			case BLOCK_FACE_XM: return 0x2;
+			case BLOCK_FACE_XP: return 0x1;
 			default:
 			{
 				ASSERT(!"Unhandled block face!");
diff --git a/src/Blocks/BlockComparator.cpp b/src/Blocks/BlockComparator.cpp
deleted file mode 100644
index 8bc0ac5ac..000000000
--- a/src/Blocks/BlockComparator.cpp
+++ /dev/null
@@ -1,53 +0,0 @@
-
-#include "Globals.h"
-#include "BlockComparator.h"
-#include "BlockRedstoneRepeater.h"
-#include "../Entities/Player.h"
-
-
-
-
-
-cBlockComparatorHandler::cBlockComparatorHandler(BLOCKTYPE a_BlockType)
-	: cBlockHandler(a_BlockType)
-{
-}
-
-
-
-
-
-void cBlockComparatorHandler::OnDestroyed(cWorld *a_World, int a_BlockX, int a_BlockY, int a_BlockZ)
-{
-	// Nothing needed yet
-}
-
-
-
-
-
-void cBlockComparatorHandler::OnUse(cWorld *a_World, cPlayer *a_Player, int a_BlockX, int a_BlockY, int a_BlockZ, char a_BlockFace, int a_CursorX, int a_CursorY, int a_CursorZ)
-{
-	NIBBLETYPE Meta = a_World->GetBlockMeta(a_BlockX, a_BlockY, a_BlockZ);
-	Meta ^= 0x04; // Toggle 3rd (addition/subtraction) bit with XOR
-	a_World->SetBlockMeta(a_BlockX, a_BlockY, a_BlockZ, Meta);
-}
-
-
-
-
-bool cBlockComparatorHandler::GetPlacementBlockTypeMeta(
-	cWorld * a_World, cPlayer * a_Player,
-	int a_BlockX, int a_BlockY, int a_BlockZ, char a_BlockFace, 
-	int a_CursorX, int a_CursorY, int a_CursorZ,
-	BLOCKTYPE & a_BlockType, NIBBLETYPE & a_BlockMeta
-)
-{
-	a_BlockType = m_BlockType;
-	a_BlockMeta = cBlockRedstoneRepeaterHandler::RepeaterRotationToMetaData(a_Player->GetRotation());
-	return true;
-}
-
-
-
-
diff --git a/src/Blocks/BlockComparator.h b/src/Blocks/BlockComparator.h
index cb2941d3c..e7e18bac9 100644
--- a/src/Blocks/BlockComparator.h
+++ b/src/Blocks/BlockComparator.h
@@ -2,6 +2,7 @@
 #pragma once
 
 #include "BlockHandler.h"
+#include "BlockRedstoneRepeater.h"
 
 
 
@@ -11,10 +12,18 @@ class cBlockComparatorHandler :
 	public cBlockHandler
 {
 public:
-	cBlockComparatorHandler(BLOCKTYPE a_BlockType);
-	virtual void OnDestroyed(cWorld * a_World, int a_BlockX, int a_BlockY, int a_BlockZ) override;
+	cBlockComparatorHandler(BLOCKTYPE a_BlockType)
+		: cBlockHandler(a_BlockType)
+	{
+	}
+
 	
-	virtual void OnUse(cWorld * a_World, cPlayer * a_Player, int a_BlockX, int a_BlockY, int a_BlockZ, char a_BlockFace, int a_CursorX, int a_CursorY, int a_CursorZ) override;
+	virtual void OnUse(cWorld * a_World, cPlayer * a_Player, int a_BlockX, int a_BlockY, int a_BlockZ, char a_BlockFace, int a_CursorX, int a_CursorY, int a_CursorZ) override
+	{
+		NIBBLETYPE Meta = a_World->GetBlockMeta(a_BlockX, a_BlockY, a_BlockZ);
+		Meta ^= 0x04; // Toggle 3rd (addition/subtraction) bit with XOR
+		a_World->SetBlockMeta(a_BlockX, a_BlockY, a_BlockZ, Meta);
+	}
 
 
 	virtual void ConvertToPickups(cItems & a_Pickups, NIBBLETYPE a_BlockMeta) override
@@ -38,10 +47,15 @@ public:
 
 	virtual bool GetPlacementBlockTypeMeta(
 		cWorld * a_World, cPlayer * a_Player,
-		int a_BlockX, int a_BlockY, int a_BlockZ, char a_BlockFace, 
+		int a_BlockX, int a_BlockY, int a_BlockZ, char a_BlockFace,
 		int a_CursorX, int a_CursorY, int a_CursorZ,
 		BLOCKTYPE & a_BlockType, NIBBLETYPE & a_BlockMeta
-	) override;
+		) override
+	{
+		a_BlockType = m_BlockType;
+		a_BlockMeta = cBlockRedstoneRepeaterHandler::RepeaterRotationToMetaData(a_Player->GetRotation());
+		return true;
+	}
 
 
 	virtual const char * GetStepSound(void) override
diff --git a/src/Blocks/BlockHandler.cpp b/src/Blocks/BlockHandler.cpp
index 3448cf8a1..7bb35efeb 100644
--- a/src/Blocks/BlockHandler.cpp
+++ b/src/Blocks/BlockHandler.cpp
@@ -61,6 +61,7 @@
 #include "BlockSugarcane.h"
 #include "BlockTallGrass.h"
 #include "BlockTorch.h"
+#include "BlockTrapdoor.h"
 #include "BlockVine.h"
 #include "BlockWood.h"
 #include "BlockWorkbench.h"
@@ -193,6 +194,7 @@ cBlockHandler * cBlockHandler::CreateBlockHandler(BLOCKTYPE a_BlockType)
 		case E_BLOCK_SUGARCANE:             return new cBlockSugarcaneHandler       (a_BlockType);
 		case E_BLOCK_TALL_GRASS:            return new cBlockTallGrassHandler       (a_BlockType);
 		case E_BLOCK_TORCH:                 return new cBlockTorchHandler           (a_BlockType);
+		case E_BLOCK_TRAPDOOR:              return new cBlockTrapdoorHandler        (a_BlockType);
 		case E_BLOCK_VINES:                 return new cBlockVineHandler            (a_BlockType);
 		case E_BLOCK_WALLSIGN:              return new cBlockSignHandler            (a_BlockType);
 		case E_BLOCK_WATER:                 return new cBlockFluidHandler           (a_BlockType);
diff --git a/src/Blocks/BlockHandler.h b/src/Blocks/BlockHandler.h
index 80dccd8c7..107d36476 100644
--- a/src/Blocks/BlockHandler.h
+++ b/src/Blocks/BlockHandler.h
@@ -98,7 +98,10 @@ public:
 	*/
 	virtual bool DoesIgnoreBuildCollision(void);
 
-	/// Does this block drop if it gets destroyed by an unsuitable situation? Default: true
+	/// <summary>Similar to DoesIgnoreBuildCollision(void), but is used for cases where block meta/player item-in-hand is needed to determine collision (thin snow)</summary>
+	virtual bool DoesIgnoreBuildCollision(cPlayer * a_Player, NIBBLETYPE a_Meta) { return DoesIgnoreBuildCollision(); }
+
+	/// <summary>Returns if this block drops if it gets destroyed by an unsuitable situation. Default: true</summary>
 	virtual bool DoesDropOnUnsuitable(void);
 	
 	/** Called when one of the neighbors gets set; equivalent to MC block update. 
@@ -107,26 +110,30 @@ public:
 	*/
 	virtual void Check(int a_RelX, int a_RelY, int a_RelZ, cChunk & a_Chunk);
 	
-	/// Returns the meta for a block after rotating it counter-clockwise from the specified meta. Default: no change
+	/// <summary>Rotates a given block meta counter-clockwise. Default: no change</summary>
+	/// <returns>Block meta following rotation</returns>
 	virtual NIBBLETYPE MetaRotateCCW(NIBBLETYPE a_Meta) { return a_Meta; }
 	
-	/// Returns the meta for a block after rotating it clockwise from the specified meta. Default: no change
+	/// <summary>Rotates a given block meta clockwise. Default: no change</summary>
+	/// <returns>Block meta following rotation</returns>
 	virtual NIBBLETYPE MetaRotateCW(NIBBLETYPE a_Meta) { return a_Meta; }
 	
-	/// Returns the meta for a block after mirroring it around the XY plane. Default: no change
+	/// <summary>Mirros a given block meta around the XY plane. Default: no change</summary>
+	/// <returns>Block meta following mirroring</returns>
 	virtual NIBBLETYPE MetaMirrorXY(NIBBLETYPE a_Meta) { return a_Meta; }
 
-	/// Returns the meta for a block after mirroring it around the XZ plane. Default: no change
+	/// <summary>Mirros a given block meta around the XZ plane. Default: no change</summary>
+	/// <returns>Block meta following mirroring</returns>
 	virtual NIBBLETYPE MetaMirrorXZ(NIBBLETYPE a_Meta) { return a_Meta; }
 
-	/// Returns the meta for a block after mirroring it around the YZ plane. Default: no change
+	/// <summary>Mirros a given block meta around the YZ plane. Default: no change</summary>
+	/// <returns>Block meta following mirroring</returns>
 	virtual NIBBLETYPE MetaMirrorYZ(NIBBLETYPE a_Meta) { return a_Meta; }
-
-
-	/// Get the blockhandler for a specific block id
+	
+	/// <summary>Get the blockhandler for a specific block id</summary>
 	static cBlockHandler * GetBlockHandler(BLOCKTYPE a_BlockType);
 
-	/// Deletes all initialised block handlers
+	/// <summary>Deletes all initialised block handlers</summary>
 	static void Deinit();
 	
 protected:
diff --git a/src/Blocks/BlockLever.cpp b/src/Blocks/BlockLever.cpp
deleted file mode 100644
index c482b0246..000000000
--- a/src/Blocks/BlockLever.cpp
+++ /dev/null
@@ -1,31 +0,0 @@
-
-#include "Globals.h"
-#include "BlockLever.h"
-#include "../Entities/Player.h"
-#include "../Simulator/RedstoneSimulator.h"
-
-
-
-
-
-cBlockLeverHandler::cBlockLeverHandler(BLOCKTYPE a_BlockType)
-	: cBlockHandler(a_BlockType)
-{
-}
-
-
-
-
-
-void cBlockLeverHandler::OnUse(cWorld *a_World, cPlayer *a_Player, int a_BlockX, int a_BlockY, int a_BlockZ, char a_BlockFace, int a_CursorX, int a_CursorY, int a_CursorZ)
-{
-	// Flip the ON bit on/off using the XOR bitwise operation
-	NIBBLETYPE Meta = (a_World->GetBlockMeta(a_BlockX, a_BlockY, a_BlockZ) ^ 0x08);
-
-	a_World->SetBlock(a_BlockX, a_BlockY, a_BlockZ, m_BlockType, Meta);
-	a_World->BroadcastSoundEffect("random.click", a_BlockX * 8, a_BlockY * 8, a_BlockZ * 8, 0.5f, (Meta & 0x08) ? 0.6f : 0.5f);
-}
-
-
-
-
diff --git a/src/Blocks/BlockLever.h b/src/Blocks/BlockLever.h
index 5e6a3bd1e..15fe2071c 100644
--- a/src/Blocks/BlockLever.h
+++ b/src/Blocks/BlockLever.h
@@ -10,9 +10,19 @@ class cBlockLeverHandler :
 	public cBlockHandler
 {
 public:
-	cBlockLeverHandler(BLOCKTYPE a_BlockType);
+	cBlockLeverHandler(BLOCKTYPE a_BlockType)
+		: cBlockHandler(a_BlockType)
+	{
+	}
 	
-	virtual void OnUse(cWorld * a_World, cPlayer * a_Player, int a_BlockX, int a_BlockY, int a_BlockZ, char a_BlockFace, int a_CursorX, int a_CursorY, int a_CursorZ) override;
+	virtual void OnUse(cWorld * a_World, cPlayer * a_Player, int a_BlockX, int a_BlockY, int a_BlockZ, char a_BlockFace, int a_CursorX, int a_CursorY, int a_CursorZ) override
+	{
+		// Flip the ON bit on/off using the XOR bitwise operation
+		NIBBLETYPE Meta = (a_World->GetBlockMeta(a_BlockX, a_BlockY, a_BlockZ) ^ 0x08);
+
+		a_World->SetBlockMeta(a_BlockX, a_BlockY, a_BlockZ, Meta);
+		a_World->BroadcastSoundEffect("random.click", a_BlockX * 8, a_BlockY * 8, a_BlockZ * 8, 0.5f, (Meta & 0x08) ? 0.6f : 0.5f);
+	}
 
 
 	virtual void ConvertToPickups(cItems & a_Pickups, NIBBLETYPE a_BlockMeta) override
diff --git a/src/Blocks/BlockRedstone.cpp b/src/Blocks/BlockRedstone.cpp
deleted file mode 100644
index 35cdc34cf..000000000
--- a/src/Blocks/BlockRedstone.cpp
+++ /dev/null
@@ -1,27 +0,0 @@
-
-#include "Globals.h"
-#include "BlockRedstone.h"
-#include "../Item.h"
-#include "../World.h"
-
-
-
-
-
-cBlockRedstoneHandler::cBlockRedstoneHandler(BLOCKTYPE a_BlockType)
-	: cBlockHandler(a_BlockType)
-{
-}
-
-
-
-
-
-void cBlockRedstoneHandler::OnDestroyed(cWorld *a_World, int a_BlockX, int a_BlockY, int a_BlockZ)
-{
-	// Nothing needed yet
-}
-
-
-
-
diff --git a/src/Blocks/BlockRedstone.h b/src/Blocks/BlockRedstone.h
index f28f3f2d6..57bd91b46 100644
--- a/src/Blocks/BlockRedstone.h
+++ b/src/Blocks/BlockRedstone.h
@@ -12,9 +12,10 @@ class cBlockRedstoneHandler :
 	public cBlockHandler
 {
 public:
-	cBlockRedstoneHandler(BLOCKTYPE a_BlockType);
-
-	virtual void OnDestroyed(cWorld * a_World, int a_BlockX, int a_BlockY, int a_BlockZ) override;
+	cBlockRedstoneHandler(BLOCKTYPE a_BlockType)
+		: cBlockHandler(a_BlockType)
+	{
+	}
 	
 
 	virtual bool CanBeAt(int a_RelX, int a_RelY, int a_RelZ, const cChunk & a_Chunk) override
diff --git a/src/Blocks/BlockRedstoneRepeater.cpp b/src/Blocks/BlockRedstoneRepeater.cpp
deleted file mode 100644
index 3ab5bc559..000000000
--- a/src/Blocks/BlockRedstoneRepeater.cpp
+++ /dev/null
@@ -1,50 +0,0 @@
-
-#include "Globals.h"
-#include "BlockRedstoneRepeater.h"
-#include "../Entities/Player.h"
-
-
-
-
-
-cBlockRedstoneRepeaterHandler::cBlockRedstoneRepeaterHandler(BLOCKTYPE a_BlockType)
-	: cBlockHandler(a_BlockType)
-{
-}
-
-
-
-
-
-void cBlockRedstoneRepeaterHandler::OnDestroyed(cWorld *a_World, int a_BlockX, int a_BlockY, int a_BlockZ)
-{
-	// Nothing needed yet
-}
-
-
-
-
-
-void cBlockRedstoneRepeaterHandler::OnUse(cWorld *a_World, cPlayer *a_Player, int a_BlockX, int a_BlockY, int a_BlockZ, char a_BlockFace, int a_CursorX, int a_CursorY, int a_CursorZ)
-{
-	a_World->SetBlockMeta(a_BlockX, a_BlockY, a_BlockZ, ((a_World->GetBlockMeta(a_BlockX, a_BlockY, a_BlockZ) + 0x04) & 0x0f));
-}
-
-
-
-
-bool cBlockRedstoneRepeaterHandler::GetPlacementBlockTypeMeta(
-	cWorld * a_World, cPlayer * a_Player,
-	int a_BlockX, int a_BlockY, int a_BlockZ, char a_BlockFace, 
-	int a_CursorX, int a_CursorY, int a_CursorZ,
-	BLOCKTYPE & a_BlockType, NIBBLETYPE & a_BlockMeta
-)
-{
-	a_BlockType = m_BlockType;
-	a_BlockMeta = RepeaterRotationToMetaData(a_Player->GetRotation());
-	return true;
-}
-
-
-
-
diff --git a/src/Blocks/BlockRedstoneRepeater.h b/src/Blocks/BlockRedstoneRepeater.h
index a61121d3a..1fcddd4f8 100644
--- a/src/Blocks/BlockRedstoneRepeater.h
+++ b/src/Blocks/BlockRedstoneRepeater.h
@@ -11,10 +11,29 @@ class cBlockRedstoneRepeaterHandler :
 	public cBlockHandler
 {
 public:
-	cBlockRedstoneRepeaterHandler(BLOCKTYPE a_BlockType);
-	virtual void OnDestroyed(cWorld * a_World, int a_BlockX, int a_BlockY, int a_BlockZ) override;
+	cBlockRedstoneRepeaterHandler(BLOCKTYPE a_BlockType)
+		: cBlockHandler(a_BlockType)
+	{
+	}
+
+
+	virtual bool GetPlacementBlockTypeMeta(
+		cWorld * a_World, cPlayer * a_Player,
+		int a_BlockX, int a_BlockY, int a_BlockZ, char a_BlockFace,
+		int a_CursorX, int a_CursorY, int a_CursorZ,
+		BLOCKTYPE & a_BlockType, NIBBLETYPE & a_BlockMeta
+		) override
+	{
+		a_BlockType = m_BlockType;
+		a_BlockMeta = RepeaterRotationToMetaData(a_Player->GetRotation());
+		return true;
+	}
 	
-	virtual void OnUse(cWorld * a_World, cPlayer * a_Player, int a_BlockX, int a_BlockY, int a_BlockZ, char a_BlockFace, int a_CursorX, int a_CursorY, int a_CursorZ) override;
+
+	virtual void OnUse(cWorld * a_World, cPlayer * a_Player, int a_BlockX, int a_BlockY, int a_BlockZ, char a_BlockFace, int a_CursorX, int a_CursorY, int a_CursorZ) override
+	{
+		a_World->SetBlockMeta(a_BlockX, a_BlockY, a_BlockZ, ((a_World->GetBlockMeta(a_BlockX, a_BlockY, a_BlockZ) + 0x04) & 0x0f));
+	}
 
 
 	virtual void ConvertToPickups(cItems & a_Pickups, NIBBLETYPE a_BlockMeta) override
@@ -34,14 +53,6 @@ public:
 	{
 		return ((a_RelY > 0) && (a_Chunk.GetBlock(a_RelX, a_RelY - 1, a_RelZ) != E_BLOCK_AIR));
 	}
-	
-
-	virtual bool GetPlacementBlockTypeMeta(
-		cWorld * a_World, cPlayer * a_Player,
-		int a_BlockX, int a_BlockY, int a_BlockZ, char a_BlockFace, 
-		int a_CursorX, int a_CursorY, int a_CursorZ,
-		BLOCKTYPE & a_BlockType, NIBBLETYPE & a_BlockMeta
-	) override;
 
 
 	virtual const char * GetStepSound(void) override
diff --git a/src/Blocks/BlockSnow.h b/src/Blocks/BlockSnow.h
index b8d48362c..d7fd1e19e 100644
--- a/src/Blocks/BlockSnow.h
+++ b/src/Blocks/BlockSnow.h
@@ -25,21 +25,37 @@ public:
 	) override
 	{
 		a_BlockType = m_BlockType;
-		NIBBLETYPE Meta = a_World->GetBlockMeta(Vector3i(a_BlockX, a_BlockY, a_BlockZ));
 
-		if ((Meta < 7) && (Meta != 0)) // Is height at maximum (7) or at mininum (0)? Don't do anything if so
+		BLOCKTYPE BlockBeforePlacement;
+		NIBBLETYPE MetaBeforePlacement;
+		a_World->GetBlockTypeMeta(a_BlockX, a_BlockY, a_BlockZ, BlockBeforePlacement, MetaBeforePlacement);
+
+		if ((BlockBeforePlacement == E_BLOCK_SNOW) && (MetaBeforePlacement < 7))
 		{
-			Meta++;
+			// Only increment if:
+			//	A snow block was already there (not first time placement) AND
+			//	Height is smaller than 7, the maximum possible height
+			MetaBeforePlacement++;
 		}
 		
-		a_BlockMeta = Meta;
+		a_BlockMeta = MetaBeforePlacement;
 		return true;
 	}
 
 
-	virtual bool DoesIgnoreBuildCollision(void) override
+	virtual bool DoesIgnoreBuildCollision(cPlayer * a_Player, NIBBLETYPE a_Meta) override
 	{
-		return true;
+		if ((a_Player->GetEquippedItem().m_ItemType == E_BLOCK_SNOW) && (a_Meta < 7))
+		{
+			return true; // If a player is holding a (thin) snow block and it's size can be increased, return collision ignored
+		}
+
+		if (a_Meta == 0)
+		{
+			return true; // If at normal snowfall height (lowest), we ignore collision
+		}
+
+		return false;
 	}
 	
 
@@ -51,7 +67,19 @@ public:
 
 	virtual bool CanBeAt(int a_RelX, int a_RelY, int a_RelZ, const cChunk & a_Chunk) override
 	{
-		return (a_RelY > 0) && g_BlockIsSnowable[a_Chunk.GetBlock(a_RelX, a_RelY - 1, a_RelZ)];
+		if (a_RelY > 0)
+		{
+			BLOCKTYPE BlockBelow = a_Chunk.GetBlock(a_RelX, a_RelY - 1, a_RelZ);
+			NIBBLETYPE MetaBelow = a_Chunk.GetMeta(a_RelX, a_RelY - 1, a_RelZ);
+			
+			if (g_BlockIsSnowable[BlockBelow] || ((BlockBelow == E_BLOCK_SNOW) && (MetaBelow == 7)))
+			{
+				// If block below is snowable, or it is a thin slow block and has a meta of 7 (full thin snow block), say yay
+				return true;
+			}
+		}
+		
+		return false;
 	}
 	
 	
diff --git a/src/Blocks/BlockStairs.h b/src/Blocks/BlockStairs.h
index 8d259eee3..fa378e4b5 100644
--- a/src/Blocks/BlockStairs.h
+++ b/src/Blocks/BlockStairs.h
@@ -47,8 +47,28 @@ public:
 		return true;
 	}
 	
-	// TODO: step sound
-	
+	virtual const char * GetStepSound(void) override
+	{
+		if (
+			(m_BlockType == E_BLOCK_WOODEN_STAIRS) ||
+			(m_BlockType == E_BLOCK_SPRUCE_WOOD_STAIRS) ||
+			(m_BlockType == E_BLOCK_JUNGLE_WOOD_STAIRS) ||
+			(m_BlockType == E_BLOCK_ACACIA_WOOD_STAIRS) ||
+			(m_BlockType == E_BLOCK_BIRCH_WOOD_STAIRS) ||
+			(m_BlockType == E_BLOCK_DARK_OAK_WOOD_STAIRS)
+			)
+		{
+			return "step.wood";
+		}
+
+		return "step.stone";
+	}
+
+	virtual void ConvertToPickups(cItems & a_Pickups, NIBBLETYPE a_BlockMeta) override
+	{
+		// Reset meta to 0
+		a_Pickups.push_back(cItem(m_BlockType, 1, 0));
+	}
 	
 	static NIBBLETYPE RotationToMetaData(double a_Rotation)
 	{
diff --git a/src/Blocks/BlockStems.h b/src/Blocks/BlockStems.h
index e17f2ea3d..c2dff62cf 100644
--- a/src/Blocks/BlockStems.h
+++ b/src/Blocks/BlockStems.h
@@ -2,7 +2,6 @@
 #pragma once
 
 #include "BlockHandler.h"
-#include "../MersenneTwister.h"
 #include "../World.h"
 
 
diff --git a/src/Blocks/BlockTrapdoor.h b/src/Blocks/BlockTrapdoor.h
new file mode 100644
index 000000000..58d770d23
--- /dev/null
+++ b/src/Blocks/BlockTrapdoor.h
@@ -0,0 +1,108 @@
+
+#pragma once
+
+#include "BlockHandler.h"
+
+
+
+
+
+class cBlockTrapdoorHandler :
+	public cBlockHandler
+{
+public:
+	cBlockTrapdoorHandler(BLOCKTYPE a_BlockType)
+		: cBlockHandler(a_BlockType)
+	{
+	}
+
+	virtual const char * GetStepSound(void) override
+	{
+		return "step.wood";
+	}
+
+	virtual void ConvertToPickups(cItems & a_Pickups, NIBBLETYPE a_BlockMeta) override
+	{
+		// Reset meta to 0
+		a_Pickups.push_back(cItem(m_BlockType, 1, 0));
+	}
+
+	virtual bool IsUseable(void) override
+	{
+		return true;
+	}
+
+	void OnUse(cWorld * a_World, cPlayer * a_Player, int a_BlockX, int a_BlockY, int a_BlockZ, char a_BlockFace, int a_CursorX, int a_CursorY, int a_CursorZ)
+	{
+		// Flip the ON bit on/off using the XOR bitwise operation
+		NIBBLETYPE Meta = (a_World->GetBlockMeta(a_BlockX, a_BlockY, a_BlockZ) ^ 0x04);
+
+		a_World->SetBlockMeta(a_BlockX, a_BlockY, a_BlockZ, Meta);
+	}
+
+	virtual bool GetPlacementBlockTypeMeta(
+		cWorld * a_World, cPlayer * a_Player,
+		int a_BlockX, int a_BlockY, int a_BlockZ, char a_BlockFace,
+		int a_CursorX, int a_CursorY, int a_CursorZ,
+		BLOCKTYPE & a_BlockType, NIBBLETYPE & a_BlockMeta
+		) override
+	{
+		a_BlockType = m_BlockType;
+		a_BlockMeta = BlockFaceToMetaData(a_BlockFace);
+
+		/* TODO: fix CursorY issues and uncomment this
+		if (a_CursorY > 7)
+		{
+			a_BlockMeta |= 0x8;
+		}
+		*/
+		return true;
+	}
+	
+	inline static NIBBLETYPE BlockFaceToMetaData(char a_BlockFace)
+	{
+		switch (a_BlockFace)
+		{
+			case BLOCK_FACE_ZP: return 0x1;
+			case BLOCK_FACE_ZM: return 0x0;
+			case BLOCK_FACE_XP: return 0x3;
+			case BLOCK_FACE_XM: return 0x2;
+			default:
+			{
+				ASSERT(!"Unhandled block face!");
+				return 0x0;
+			}
+		}
+	}
+
+	inline static NIBBLETYPE BlockMetaDataToBlockFace(NIBBLETYPE a_Meta)
+	{
+		switch (a_Meta & 0x3)
+		{
+			case 0x0: return BLOCK_FACE_ZM;
+			case 0x1: return BLOCK_FACE_ZP;
+			case 0x2: return BLOCK_FACE_XM;
+			case 0x3: return BLOCK_FACE_XP;
+			default:
+			{
+				ASSERT(!"Unhandled block meta!");
+				return BLOCK_FACE_NONE;
+			}
+		}
+	}
+
+	virtual bool CanBeAt(int a_RelX, int a_RelY, int a_RelZ, const cChunk & a_Chunk) override
+	{
+		NIBBLETYPE Meta;
+		a_Chunk.UnboundedRelGetBlockMeta(a_RelX, a_RelY, a_RelZ, Meta);
+
+		AddFaceDirection(a_RelX, a_RelY, a_RelZ, BlockMetaDataToBlockFace(Meta), true);
+		BLOCKTYPE BlockIsOn; a_Chunk.UnboundedRelGetBlockType(a_RelX, a_RelY, a_RelZ, BlockIsOn);
+
+		return (a_RelY > 0) && (g_BlockIsSolid[BlockIsOn]);
+	}
+};
+
+
+
+
diff --git a/src/ClientHandle.cpp b/src/ClientHandle.cpp
index b3e12ce77..f9a48003e 100644
--- a/src/ClientHandle.cpp
+++ b/src/ClientHandle.cpp
@@ -891,14 +891,14 @@ void cClientHandle::HandlePlaceBlock(int a_BlockX, int a_BlockY, int a_BlockZ, c
 	else
 	{
 		// Check if the block ignores build collision (water, grass etc.):
-		cBlockHandler * Handler = cBlockHandler::GetBlockHandler(ClickedBlock);
-		if (Handler->DoesIgnoreBuildCollision())
+		if (
+			BlockHandler(ClickedBlock)->DoesIgnoreBuildCollision() ||
+			BlockHandler(ClickedBlock)->DoesIgnoreBuildCollision(m_Player, ClickedBlockMeta)
+			)
 		{
-			Handler->OnDestroyedByPlayer(World, m_Player, a_BlockX, a_BlockY, a_BlockZ);
+			BlockHandler(ClickedBlock)->OnDestroyedByPlayer(World, m_Player, a_BlockX, a_BlockY, a_BlockZ);
 		}
-
-		BLOCKTYPE PlaceBlock = World->GetBlock(a_BlockX, a_BlockY, a_BlockZ);
-		if (!BlockHandler(PlaceBlock)->DoesIgnoreBuildCollision())
+		else
 		{
 			AddFaceDirection(a_BlockX, a_BlockY, a_BlockZ, a_BlockFace);
 			
@@ -908,7 +908,9 @@ void cClientHandle::HandlePlaceBlock(int a_BlockX, int a_BlockY, int a_BlockZ, c
 				return;
 			}
 			
-			BLOCKTYPE PlaceBlock = World->GetBlock(a_BlockX, a_BlockY, a_BlockZ);
+			NIBBLETYPE PlaceMeta;
+			BLOCKTYPE PlaceBlock;
+			World->GetBlockTypeMeta(a_BlockX, a_BlockY, a_BlockZ, PlaceBlock, PlaceMeta);
 
 			// Clicked on side of block, make sure that placement won't be cancelled if there is a slab able to be double slabbed.
 			// No need to do combinability (dblslab) checks, client will do that here.
@@ -918,10 +920,13 @@ void cClientHandle::HandlePlaceBlock(int a_BlockX, int a_BlockY, int a_BlockZ, c
 			}
 			else
 			{
-				if (!BlockHandler(PlaceBlock)->DoesIgnoreBuildCollision())
+				if (
+					!BlockHandler(PlaceBlock)->DoesIgnoreBuildCollision() &&
+					!BlockHandler(PlaceBlock)->DoesIgnoreBuildCollision(m_Player, PlaceMeta)
+					)
 				{
 					// Tried to place a block *into* another?
-					// Happens when you place a block aiming at side of block like torch or stem
+					// Happens when you place a block aiming at side of block with a torch on it or stem beside it
 					return;
 				}
 			}
diff --git a/src/Simulator/RedstoneSimulator.cpp b/src/Simulator/RedstoneSimulator.cpp
index 81d4e26f6..c93741a0e 100644
--- a/src/Simulator/RedstoneSimulator.cpp
+++ b/src/Simulator/RedstoneSimulator.cpp
@@ -76,92 +76,100 @@ void cRedstoneSimulator::SimulateChunk(float a_Dt, int a_ChunkX, int a_ChunkZ, c
 	int BaseX = a_Chunk->GetPosX() * cChunkDef::Width;
 	int BaseZ = a_Chunk->GetPosZ() * cChunkDef::Width;
 
-	for (cRedstoneSimulatorChunkData::iterator dataitr = ChunkData.begin(), end = ChunkData.end(); dataitr != end;)
+	// Check to see if PoweredBlocks have invalid items (source is air or unpowered)
+	for (PoweredBlocksList::iterator itr = m_PoweredBlocks.begin(); itr != m_PoweredBlocks.end();)
 	{
-		BLOCKTYPE BlockType = a_Chunk->GetBlock(dataitr->x, dataitr->y, dataitr->z);
-		if (!IsAllowedBlock(BlockType))
+		sPoweredBlocks & Change = *itr;
+
+		int RelX = Change.a_SourcePos.x - a_ChunkX * cChunkDef::Width;
+		int RelZ = Change.a_SourcePos.z - a_ChunkZ * cChunkDef::Width;
+
+		BLOCKTYPE SourceBlockType;
+		NIBBLETYPE SourceBlockMeta;
+		if (!a_Chunk->UnboundedRelGetBlock(RelX, Change.a_SourcePos.y, RelZ, SourceBlockType, SourceBlockMeta))
 		{
-			dataitr = ChunkData.erase(dataitr);
 			continue;
 		}
 
-		// Check to see if PoweredBlocks have invalid items (source is air or unpowered)
-		for (PoweredBlocksList::iterator itr = m_PoweredBlocks.begin(); itr != m_PoweredBlocks.end();)
+		if (SourceBlockType != Change.a_SourceBlock)
 		{
-			sPoweredBlocks & Change = *itr;
+			itr = m_PoweredBlocks.erase(itr);
+			LOGD("cRedstoneSimulator: Erased block %s from powered blocks list due to present/past block type mismatch", ItemToFullString(Change.a_SourceBlock));
+		}
+		else if (
+			// Changeable sources
+			((SourceBlockType == E_BLOCK_REDSTONE_WIRE) && (SourceBlockMeta == 0)) ||
+			((SourceBlockType == E_BLOCK_LEVER) && !IsLeverOn(SourceBlockMeta)) ||
+			((SourceBlockType == E_BLOCK_DETECTOR_RAIL) && (SourceBlockMeta & 0x08) == 0x08) ||
+			(((SourceBlockType == E_BLOCK_STONE_BUTTON) || (SourceBlockType == E_BLOCK_WOODEN_BUTTON)) && (!IsButtonOn(SourceBlockMeta)))
+			)
+		{
+			itr = m_PoweredBlocks.erase(itr);
+			LOGD("cRedstoneSimulator: Erased block %s from powered blocks list due to present/past metadata mismatch", ItemToFullString(Change.a_SourceBlock));
+		}
+		else
+		{
+			itr++;
+		}
+	}
 
-			int RelX = Change.a_SourcePos.x - a_ChunkX * cChunkDef::Width;
-			int RelZ = Change.a_SourcePos.z - a_ChunkZ * cChunkDef::Width;
+	// Check to see if LinkedPoweredBlocks have invalid items: source, block powered through, or power destination block has changed
+	for (LinkedBlocksList::iterator itr = m_LinkedPoweredBlocks.begin(); itr != m_LinkedPoweredBlocks.end();)
+	{
+		sLinkedPoweredBlocks & Change = *itr;
 
-			BLOCKTYPE SourceBlockType;
-			NIBBLETYPE SourceBlockMeta;
-			a_Chunk->UnboundedRelGetBlock(RelX, Change.a_SourcePos.y, RelZ, SourceBlockType, SourceBlockMeta);
+		int RelX = Change.a_SourcePos.x - a_ChunkX * cChunkDef::Width;
+		int RelZ = Change.a_SourcePos.z - a_ChunkZ * cChunkDef::Width;
+		int MidRelX = Change.a_MiddlePos.x - a_ChunkX * cChunkDef::Width;
+		int MidRelZ = Change.a_MiddlePos.z - a_ChunkZ * cChunkDef::Width;
 
-			if (SourceBlockType != Change.a_SourceBlock)
-			{
-				itr = m_PoweredBlocks.erase(itr);
-				LOGD("cRedstoneSimulator: Erased block %s from powered blocks list due to present/past block type mismatch", ItemToFullString(Change.a_SourceBlock));
-			}
-			else if (
-				// Changeable sources
-				((SourceBlockType == E_BLOCK_REDSTONE_WIRE) && (SourceBlockMeta == 0)) ||
-				((SourceBlockType == E_BLOCK_LEVER) && !IsLeverOn(SourceBlockMeta)) ||
-				((SourceBlockType == E_BLOCK_DETECTOR_RAIL) && (SourceBlockMeta & 0x08) == 0x08) ||
-				(((SourceBlockType == E_BLOCK_STONE_BUTTON) || (SourceBlockType == E_BLOCK_WOODEN_BUTTON)) && (!IsButtonOn(SourceBlockMeta)))
-				)
-			{
-				itr = m_PoweredBlocks.erase(itr);
-				LOGD("cRedstoneSimulator: Erased block %s from powered blocks list due to present/past metadata mismatch", ItemToFullString(Change.a_SourceBlock));
-			}
-			else
-			{
-				itr++;
-			}
+		BLOCKTYPE SourceBlockType;
+		NIBBLETYPE SourceBlockMeta;
+		BLOCKTYPE MiddleBlockType;
+		if (
+			!a_Chunk->UnboundedRelGetBlock(RelX, Change.a_SourcePos.y, RelZ, SourceBlockType, SourceBlockMeta) ||
+			!a_Chunk->UnboundedRelGetBlockType(MidRelX, Change.a_MiddlePos.y, MidRelZ, MiddleBlockType)
+			)
+		{
+			continue;
 		}
 
-		// Check to see if LinkedPoweredBlocks have invalid items: source, block powered through, or power destination block has changed
-		for (LinkedBlocksList::iterator itr = m_LinkedPoweredBlocks.begin(); itr != m_LinkedPoweredBlocks.end();)
+		if (SourceBlockType != Change.a_SourceBlock)
 		{
-			sLinkedPoweredBlocks & Change = *itr;
-			
-			int RelX = Change.a_SourcePos.x - a_ChunkX * cChunkDef::Width;
-			int RelZ = Change.a_SourcePos.z - a_ChunkZ * cChunkDef::Width;
-			int MidRelX = Change.a_MiddlePos.x - a_ChunkX * cChunkDef::Width;
-			int MidRelZ = Change.a_MiddlePos.z - a_ChunkZ * cChunkDef::Width;
-
-			BLOCKTYPE SourceBlockType;
-			NIBBLETYPE SourceBlockMeta;
-			BLOCKTYPE MiddleBlockType;
-			a_Chunk->UnboundedRelGetBlock(RelX, Change.a_SourcePos.y, RelZ, SourceBlockType, SourceBlockMeta);
-			a_Chunk->UnboundedRelGetBlockType(MidRelX, Change.a_MiddlePos.y, MidRelZ, MiddleBlockType);
-
-			if (SourceBlockType != Change.a_SourceBlock)
-			{
-				itr = m_LinkedPoweredBlocks.erase(itr);
-				LOGD("cRedstoneSimulator: Erased block %s from linked powered blocks list due to present/past block type mismatch", ItemToFullString(Change.a_SourceBlock));
-			}
-			else if (MiddleBlockType != Change.a_MiddleBlock)
-			{
-				itr = m_LinkedPoweredBlocks.erase(itr);
-				LOGD("cRedstoneSimulator: Erased block %s from linked powered blocks list due to present/past middle block mismatch", ItemToFullString(Change.a_SourceBlock));
-			}
-			else if (
-				// Things that can send power through a block but which depends on meta
-				((SourceBlockType == E_BLOCK_REDSTONE_WIRE) && (SourceBlockMeta == 0)) ||
-				((SourceBlockType == E_BLOCK_LEVER) && !IsLeverOn(SourceBlockMeta)) ||
-				(((SourceBlockType == E_BLOCK_STONE_BUTTON) || (SourceBlockType == E_BLOCK_WOODEN_BUTTON)) && (!IsButtonOn(SourceBlockMeta)))
-				)
-			{
-				itr = m_LinkedPoweredBlocks.erase(itr);
-				LOGD("cRedstoneSimulator: Erased block %s from linked powered blocks list due to present/past metadata mismatch", ItemToFullString(Change.a_SourceBlock));
-			}
-			else
-			{
-				itr++;
-			}
+			itr = m_LinkedPoweredBlocks.erase(itr);
+			LOGD("cRedstoneSimulator: Erased block %s from linked powered blocks list due to present/past block type mismatch", ItemToFullString(Change.a_SourceBlock));
 		}
+		else if (MiddleBlockType != Change.a_MiddleBlock)
+		{
+			itr = m_LinkedPoweredBlocks.erase(itr);
+			LOGD("cRedstoneSimulator: Erased block %s from linked powered blocks list due to present/past middle block mismatch", ItemToFullString(Change.a_SourceBlock));
+		}
+		else if (
+			// Things that can send power through a block but which depends on meta
+			((SourceBlockType == E_BLOCK_REDSTONE_WIRE) && (SourceBlockMeta == 0)) ||
+			((SourceBlockType == E_BLOCK_LEVER) && !IsLeverOn(SourceBlockMeta)) ||
+			(((SourceBlockType == E_BLOCK_STONE_BUTTON) || (SourceBlockType == E_BLOCK_WOODEN_BUTTON)) && (!IsButtonOn(SourceBlockMeta)))
+			)
+		{
+			itr = m_LinkedPoweredBlocks.erase(itr);
+			LOGD("cRedstoneSimulator: Erased block %s from linked powered blocks list due to present/past metadata mismatch", ItemToFullString(Change.a_SourceBlock));
+		}
+		else
+		{
+			itr++;
+		}
+	}
 
-		// PoweredBlock list was fine, now to the actual handling
+	for (cRedstoneSimulatorChunkData::iterator dataitr = ChunkData.begin(), end = ChunkData.end(); dataitr != end;)
+	{
+		BLOCKTYPE BlockType = a_Chunk->GetBlock(dataitr->x, dataitr->y, dataitr->z);
+		if (!IsAllowedBlock(BlockType))
+		{
+			dataitr = ChunkData.erase(dataitr);
+			continue;
+		}
+
+		// PoweredBlock and LinkedPoweredBlock list was fine, now to the actual handling
 		int a_X = BaseX + dataitr->x;
 		int a_Z = BaseZ + dataitr->z;
 		switch (BlockType)
@@ -169,6 +177,7 @@ void cRedstoneSimulator::SimulateChunk(float a_Dt, int a_ChunkX, int a_ChunkZ, c
 			case E_BLOCK_BLOCK_OF_REDSTONE:		HandleRedstoneBlock(a_X, dataitr->y, a_Z);	break;
 			case E_BLOCK_LEVER: 				HandleRedstoneLever(a_X, dataitr->y, a_Z);	break;
 			case E_BLOCK_TNT:					HandleTNT(a_X, dataitr->y, a_Z);			break;
+			case E_BLOCK_TRAPDOOR:              HandleTrapdoor(a_X, dataitr->y, a_Z);       break;
 			case E_BLOCK_REDSTONE_WIRE:			HandleRedstoneWire(a_X, dataitr->y, a_Z);	break;
 
 			case E_BLOCK_REDSTONE_TORCH_OFF:
@@ -406,7 +415,9 @@ void cRedstoneSimulator::HandleRedstoneWire(int a_BlockX, int a_BlockY, int a_Bl
 
 				if (SurroundMeta > 1) // Wires of power 1 or 0 cannot transfer power TO ME, don't bother checking
 				{
-					if (SurroundMeta > MyMeta) // Does surrounding wire have a higher power level than self?
+					// Does surrounding wire have a higher power level than self?
+					// >= to fix a bug where wires bordering each other with the same power level will appear (in terms of meta) to power each other, when they aren't actually in the powered list
+					if (SurroundMeta >= MyMeta)
 					{
 						m_World.SetBlockMeta(a_BlockX, a_BlockY, a_BlockZ, SurroundMeta - 1);
 					}
@@ -555,7 +566,7 @@ void cRedstoneSimulator::HandleRedstoneRepeater(int a_BlockX, int a_BlockY, int
 void cRedstoneSimulator::HandlePiston(int a_BlockX, int a_BlockY, int a_BlockZ)
 {	
 	cPiston Piston(&m_World);
-	if (AreCoordsPowered(a_BlockX, a_BlockY, a_BlockZ))
+	if (IsPistonPowered(a_BlockX, a_BlockY, a_BlockZ, m_World.GetBlockMeta(a_BlockX, a_BlockY, a_BlockZ) & 0x7)) // We only want the bottom three bits (4th controls extended-ness)
 	{
 		Piston.ExtendPiston(a_BlockX, a_BlockY, a_BlockZ);
 	}
@@ -717,6 +728,22 @@ void cRedstoneSimulator::HandleRail(int a_BlockX, int a_BlockY, int a_BlockZ, BL
 
 
 
+void cRedstoneSimulator::HandleTrapdoor(int a_BlockX, int a_BlockY, int a_BlockZ)
+{
+	if (AreCoordsPowered(a_BlockX, a_BlockY, a_BlockZ))
+	{
+		m_World.SetBlockMeta(a_BlockX, a_BlockY, a_BlockZ, m_World.GetBlockMeta(a_BlockX, a_BlockY, a_BlockZ) | 0x4);
+	}
+	else
+	{
+		m_World.SetBlockMeta(a_BlockX, a_BlockY, a_BlockZ, m_World.GetBlockMeta(a_BlockX, a_BlockY, a_BlockZ) & 0xB); // Take into account that the fourth bit is needed for trapdoors too
+	}
+}
+
+
+
+
+
 bool cRedstoneSimulator::AreCoordsPowered(int a_BlockX, int a_BlockY, int a_BlockZ)
 {
 	for (PoweredBlocksList::iterator itr = m_PoweredBlocks.begin(); itr != m_PoweredBlocks.end(); ++itr) // Check powered list
@@ -747,7 +774,8 @@ bool cRedstoneSimulator::AreCoordsPowered(int a_BlockX, int a_BlockY, int a_Bloc
 
 bool cRedstoneSimulator::IsRepeaterPowered(int a_BlockX, int a_BlockY, int a_BlockZ, NIBBLETYPE a_Meta)
 {
-	// Check through powered blocks list
+	// Repeaters cannot be powered by any face except their back; verify that this is true for a source
+
 	for (PoweredBlocksList::iterator itr = m_PoweredBlocks.begin(); itr != m_PoweredBlocks.end(); ++itr)
 	{
 		sPoweredBlocks & Change = *itr;
@@ -780,7 +808,6 @@ bool cRedstoneSimulator::IsRepeaterPowered(int a_BlockX, int a_BlockY, int a_Blo
 		}
 	}
 
-	// Check linked powered list, 'middle' blocks
 	for (LinkedBlocksList::iterator itr = m_LinkedPoweredBlocks.begin(); itr != m_LinkedPoweredBlocks.end(); ++itr)
 	{
 		sLinkedPoweredBlocks & Change = *itr;
@@ -817,6 +844,53 @@ bool cRedstoneSimulator::IsRepeaterPowered(int a_BlockX, int a_BlockY, int a_Blo
 
 
 
+bool cRedstoneSimulator::IsPistonPowered(int a_BlockX, int a_BlockY, int a_BlockZ, NIBBLETYPE a_Meta)
+{
+	// Pistons cannot be powered through their front face; this function verifies that a source meets this requirement
+
+	int OldX = a_BlockX, OldY = a_BlockY, OldZ = a_BlockZ;
+
+	for (PoweredBlocksList::iterator itr = m_PoweredBlocks.begin(); itr != m_PoweredBlocks.end(); ++itr)
+	{
+		sPoweredBlocks & Change = *itr;
+
+		if (!Change.a_BlockPos.Equals(Vector3i(a_BlockX, a_BlockY, a_BlockZ))) { continue; }
+
+		AddFaceDirection(a_BlockX, a_BlockY, a_BlockZ, a_Meta); // Piston meta is based on what direction they face, so we can do this
+
+		if (!Change.a_SourcePos.Equals(Vector3i(a_BlockX, a_BlockY, a_BlockZ)))
+		{
+			return true;
+		}
+
+		a_BlockX = OldX;
+		a_BlockY = OldY;
+		a_BlockZ = OldZ;
+	}
+
+	for (LinkedBlocksList::iterator itr = m_LinkedPoweredBlocks.begin(); itr != m_LinkedPoweredBlocks.end(); ++itr)
+	{
+		sLinkedPoweredBlocks & Change = *itr;
+
+		if (!Change.a_BlockPos.Equals(Vector3i(a_BlockX, a_BlockY, a_BlockZ))) { continue; }
+
+		AddFaceDirection(a_BlockX, a_BlockY, a_BlockZ, a_Meta);
+
+		if (!Change.a_MiddlePos.Equals(Vector3i(a_BlockX, a_BlockY, a_BlockZ)))
+		{
+			return true;
+		}
+
+		a_BlockX = OldX;
+		a_BlockY = OldY;
+		a_BlockZ = OldZ;
+	}
+	return false; // Source was in front of the piston's front face
+}
+
+
+
+
 
 void cRedstoneSimulator::SetDirectionLinkedPowered(int a_BlockX, int a_BlockY, int a_BlockZ, char a_Direction, BLOCKTYPE a_SourceType)
 {
@@ -1086,7 +1160,6 @@ void cRedstoneSimulator::SetAllDirsAsPowered(int a_BlockX, int a_BlockY, int a_B
 void cRedstoneSimulator::SetBlockPowered(int a_BlockX, int a_BlockY, int a_BlockZ, int a_SourceX, int a_SourceY, int a_SourceZ, BLOCKTYPE a_SourceBlock)
 {
 	if (m_World.GetBlock(a_BlockX, a_BlockY, a_BlockZ) == E_BLOCK_AIR) { return; } // Don't set air, fixes some bugs (wires powering themselves)
-	if (AreCoordsPowered(a_BlockX, a_BlockY, a_BlockZ)) { return; } // Check for duplicates
 
 	sPoweredBlocks RC;
 	RC.a_BlockPos = Vector3i(a_BlockX, a_BlockY, a_BlockZ);
@@ -1107,7 +1180,6 @@ void cRedstoneSimulator::SetBlockLinkedPowered(int a_BlockX, int a_BlockY, int a
 	)
 {
 	if (m_World.GetBlock(a_BlockX, a_BlockY, a_BlockZ) == E_BLOCK_AIR) { return; } // Don't set air, fixes some bugs (wires powering themselves)
-	if (AreCoordsPowered(a_BlockX, a_BlockY, a_BlockZ)) { return; } // Check for duplicates
 	if (!IsViableMiddleBlock(m_World.GetBlock(a_MiddleX, a_MiddleY, a_MiddleZ))) { return; } // See if middle block is viable
 
 	sLinkedPoweredBlocks RC;
diff --git a/src/Simulator/RedstoneSimulator.h b/src/Simulator/RedstoneSimulator.h
index d3002394a..59400b614 100644
--- a/src/Simulator/RedstoneSimulator.h
+++ b/src/Simulator/RedstoneSimulator.h
@@ -93,6 +93,8 @@ private:
 	void HandleDoor(int a_BlockX, int a_BlockY, int a_BlockZ);
 	/// <summary>Handles activator, detector, and powered rails</summary>
 	void HandleRail(int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE a_MyType);
+	/// <summary>Handles trapdoors</summary>
+	void HandleTrapdoor(int a_BlockX, int a_BlockY, int a_BlockZ);
 	/* ===================== */
 
 	/* ====== Helper functions ====== */
@@ -109,6 +111,8 @@ private:
 	bool AreCoordsPowered(int a_BlockX, int a_BlockY, int a_BlockZ);
 	/// <summary>Returns if a repeater is powered</summary>
 	bool IsRepeaterPowered(int a_BlockX, int a_BlockY, int a_BlockZ, NIBBLETYPE a_Meta);
+	/// <summary>Returns if a piston is powered</summary>
+	bool IsPistonPowered(int a_BlockX, int a_BlockY, int a_BlockZ, NIBBLETYPE a_Meta);
 
 	/// <summary>Returns if lever metadata marks it as emitting power</summary>
 	bool IsLeverOn(NIBBLETYPE a_BlockMeta);