diff --git a/Graphics/levels/Chapter01/Level02/Level02.MEX b/Graphics/levels/Chapter01/Level02/Level02.MEX
index 818f57668..3ebe6eeb6 100644
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diff --git a/Graphics/levels/Chapter01/Level02/level02.Mep b/Graphics/levels/Chapter01/Level02/level02.Mep
index 947dda235..75780e0c6 100644
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diff --git a/Graphics/levels/Chapter02/Level01/level01.MEX b/Graphics/levels/Chapter02/Level01/level01.MEX
index 154cd14c5..d93941224 100644
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diff --git a/Graphics/levels/Chapter02/Level01/level01.Mep b/Graphics/levels/Chapter02/Level01/level01.Mep
index 36475d98e..9bee351dd 100644
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diff --git a/Graphics/levels/Chapter03/Level02/Level02.MEX b/Graphics/levels/Chapter03/Level02/Level02.MEX
index cdea433f7..9acb6a4d4 100644
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diff --git a/Graphics/levels/Chapter03/Level02/Level02.Mep b/Graphics/levels/Chapter03/Level02/Level02.Mep
index ad1bb7434..c6c2c524a 100644
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diff --git a/Graphics/levels/Chapter04/Level04/Level04.MEX b/Graphics/levels/Chapter04/Level04/Level04.MEX
index 0987db87b..57469e4ba 100644
Binary files a/Graphics/levels/Chapter04/Level04/Level04.MEX and b/Graphics/levels/Chapter04/Level04/Level04.MEX differ
diff --git a/Graphics/levels/Chapter04/Level04/level04.Mep b/Graphics/levels/Chapter04/Level04/level04.Mep
index 99d84207d..1343d0cc8 100644
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diff --git a/data/translations/text.dat b/data/translations/text.dat
index 4dfb5d59f..6a43f5bec 100644
--- a/data/translations/text.dat
+++ b/data/translations/text.dat
@@ -157,7 +157,7 @@ eng=Load Error!\n\nPress the X button to continue
 [STR__MEMCARD__NOSPACEONCARD]
 eng=Insufficient free blocks available on MEMORY CARD in MEMORY CARD SLOT 1. One free block required
 [STR__MEMCARD__DUPLICATESAVENAME]
-eng=Are you sure you want to\noverwrite the existing file on the MEMORY CARD in MEMORY CARD slot 1?
+eng=File already exists on the\nMEMORY CARD in MEMORY CARD slot 1\nAre you sure you want to overwrite the previous file?
 [STR__MEMCARD__DOYOUWANTTOFORMATCARD]
 eng=MEMORY CARD in MEMORY CARD slot 1 is not formatted. Do you wish to format?
 [STR__MEMCARD__FORMATTINGPLEASEWIAT]
diff --git a/source/level/level.cpp b/source/level/level.cpp
index 9bb0d0abc..c2b88a33d 100644
--- a/source/level/level.cpp
+++ b/source/level/level.cpp
@@ -745,10 +745,10 @@ sLayerHdr	*layer;
 /*****************************************************************************/
 /*****************************************************************************/
 /*****************************************************************************/
-void	CLevel::destroyMapArea(DVECTOR const &Pos)
+void	CLevel::destroyMapArea(DVECTOR const &Pos,int ColT)
 {
 DVECTOR		TL,BR;
-const int			ColT=COLLISION_TYPE_DESTRUCTABLE_WALL;
+//const int			ColT=COLLISION_TYPE_DESTRUCTABLE_WALL;
 
 
 			TL.vx=Pos.vx&-16;;
@@ -775,9 +775,12 @@ DVECTOR		DP;
 					if (*ColElem>>COLLISION_TYPE_FLAG_SHIFT==ColT)
 					{
 						sTileMapElem	*MapElem=TileLayers[CLayerTile::LAYER_TILE_TYPE_ACTION]->getMapPtr(DP.vx,DP.vy);
-						CFXFallingTile	*FX=(CFXFallingTile*)CFX::Create(CFX::FX_TYPE_FALLINGTILE,DP);
-						FX->SetTile(MapElem->Tile);
-						MapElem->Tile=0;
+						if (MapElem->Tile)
+						{
+							CFXFallingTile	*FX=(CFXFallingTile*)CFX::Create(CFX::FX_TYPE_FALLINGTILE,DP);
+							FX->SetTile(MapElem->Tile);
+							MapElem->Tile=0;
+						}
 						*ColElem=0;
 
 					}
@@ -788,11 +791,11 @@ DVECTOR		DP;
 /*****************************************************************************/
 // fixed now, so takes out whole vertical section, wherever it is hit 
 // Note: relies on tiles not being top or bottom of map tho!!
-void	CLevel::destroyMapTile(DVECTOR const &Pos)
+void	CLevel::destroyMapTile(DVECTOR const &Pos,int ColT)
 {
 int				Width=getMapWidth();
 DVECTOR			MP=Pos;
-const int		ColT=COLLISION_TYPE_DESTRUCTABLE_FLOOR;
+//const int		ColT=COLLISION_TYPE_DESTRUCTABLE_FLOOR;
 
 // Goto Top
 			while (*CollisionLayer->getMapPtr(MP.vx,MP.vy-1)>>COLLISION_TYPE_FLAG_SHIFT==ColT)
@@ -806,9 +809,12 @@ sTileMapElem	*MapElem=TileLayers[CLayerTile::LAYER_TILE_TYPE_ACTION]->getMapPtr(
 // Thrash em down
 			while (*ColElem>>COLLISION_TYPE_FLAG_SHIFT==ColT)
 			{
-				CFXFallingTile	*FX=(CFXFallingTile*)CFX::Create(CFX::FX_TYPE_FALLINGTILE,MP);
-				FX->SetTile(MapElem->Tile);
-				MapElem->Tile=0;
+				if (MapElem->Tile)
+				{
+					CFXFallingTile	*FX=(CFXFallingTile*)CFX::Create(CFX::FX_TYPE_FALLINGTILE,MP);
+					FX->SetTile(MapElem->Tile);
+					MapElem->Tile=0;
+				}
 				*ColElem=0;
 
 				MapElem+=Width;
@@ -851,6 +857,7 @@ DVECTOR		DP;
 /*****************************************************************************/
 /*****************************************************************************/
 /*****************************************************************************/
+// note: slippery used as special type in 4:4 boss arena
 void	CLevel::CreateTileStore()
 {
 int		MapW=getMapWidth();
@@ -866,7 +873,7 @@ int		X,Y;
 			{
 				u8	*ColElem=CollisionLayer->getMapPtr(X*16,Y*16);
 				int	ColT = (*ColElem) & COLLISION_TYPE_MASK;
-				if ( ColT==COLLISION_TYPE_FLAG_DESTRUCTABLE_FLOOR || ColT==COLLISION_TYPE_FLAG_DESTRUCTABLE_WALL)
+				if ( ColT==COLLISION_TYPE_FLAG_DESTRUCTABLE_FLOOR || ColT==COLLISION_TYPE_FLAG_DESTRUCTABLE_WALL || ColT==COLLISION_TYPE_FLAG_SLIPPERY)
 				{
 					m_TileStoreCount++;
 				}
@@ -884,7 +891,7 @@ int		X,Y;
 				{
 					u8	*ColElem=CollisionLayer->getMapPtr(X*16,Y*16);
 					int	ColT = (*ColElem) & COLLISION_TYPE_MASK;
-					if ( ColT==COLLISION_TYPE_FLAG_DESTRUCTABLE_FLOOR || ColT==COLLISION_TYPE_FLAG_DESTRUCTABLE_WALL)
+					if ( ColT==COLLISION_TYPE_FLAG_DESTRUCTABLE_FLOOR || ColT==COLLISION_TYPE_FLAG_DESTRUCTABLE_WALL || ColT==COLLISION_TYPE_FLAG_SLIPPERY)
 					{
 						Ptr->X=X;
 						Ptr->Y=Y;
diff --git a/source/level/level.h b/source/level/level.h
index a9677fb12..77f122b59 100644
--- a/source/level/level.h
+++ b/source/level/level.h
@@ -65,8 +65,8 @@ static int							getChapterLoadingText()					{return LvlTable[s_globalLevelSelec
 static int							getLevelLoadingText()					{return LvlTable[s_globalLevelSelectThing].LevelLoadingText;}
 static CFmaScene::FMA_SCRIPT_NUMBER getFMAToFollow()						{return LvlTable[s_globalLevelSelectThing].FMAToFollow;}
 
-		void			destroyMapArea(DVECTOR const &Pos);
-		void			destroyMapTile(DVECTOR const &Pos);
+		void			destroyMapArea(DVECTOR const &Pos,int ColT=COLLISION_TYPE_DESTRUCTABLE_WALL);
+		void			destroyMapTile(DVECTOR const &Pos,int ColT=COLLISION_TYPE_DESTRUCTABLE_FLOOR);
 
 		void			reverseMapConveyor();
 
diff --git a/source/platform/pfblock.cpp b/source/platform/pfblock.cpp
index c50845adc..748826a43 100644
--- a/source/platform/pfblock.cpp
+++ b/source/platform/pfblock.cpp
@@ -44,6 +44,11 @@ void CNpcFallingBlockPlatform::trigger()
 {
 	m_isTriggered = true;
 	m_timer = GameState::getOneSecondInFrames();
+
+// Clear collision, flagged with normal - cos rest is solid!
+	CLevel	&level=GameScene.GetLevel();
+	level.destroyMapArea(Pos,COLLISION_TYPE_SLIPPERY);
+
 }
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////