diff --git a/Docs/Changelog_sm5.txt b/Docs/Changelog_sm5.txt
index f46fd8875e..cf7ce28394 100644
--- a/Docs/Changelog_sm5.txt
+++ b/Docs/Changelog_sm5.txt
@@ -8,6 +8,13 @@ ________________________________________________________________________________
 StepMania 5.0 $next | 2011xxxx
 --------------------------------------------------------------------------------
 
+2011/10/16
+----------
+* [NoteDataUtil] Add the Backwards mod for games where the intended
+  definition of Mirror is different. Regarding Pump gameplay, what was
+  called Mirror in Preview 4 is considered Backwards now, and the original
+  Mirror is back in its old position. [Wolfman2000]
+
 2011/10/12
 ----------
 * [Steps] Fix a bug where e.g. ".SM" ".DWI" ".Sm" ".sM" files
diff --git a/Docs/Luadoc/Lua.xml b/Docs/Luadoc/Lua.xml
index 1f9ee43352..e22eff351b 100644
--- a/Docs/Luadoc/Lua.xml
+++ b/Docs/Luadoc/Lua.xml
@@ -939,6 +939,7 @@
 		<Class name='PlayerOptions'>
 			<Function name='GetAlternate'/>
 			<Function name='GetAttackMines'/>
+			<Function name='GetBackwards'/>
 			<Function name='GetBMRize'/>
 			<Function name='GetBeat'/>
 			<Function name='GetBig'/>
diff --git a/Docs/Luadoc/LuaDocumentation.xml b/Docs/Luadoc/LuaDocumentation.xml
index 436c602a5d..6f2baf83d1 100644
--- a/Docs/Luadoc/LuaDocumentation.xml
+++ b/Docs/Luadoc/LuaDocumentation.xml
@@ -2484,6 +2484,9 @@
 	</Function>
 	<Function name='GetAttackMines' return='bool' arguments=''>
 		
+	</Function>
+	<Function name='GetBackwards' return='bool' arguments=''>
+		Returns <code>true</code> if the backwards mod is applied, <code>false</code> otherwise.
 	</Function>
 	<Function name='GetBeat' return='float' arguments=''>
 		
diff --git a/Themes/_fallback/metrics.ini b/Themes/_fallback/metrics.ini
index 64fed11c4e..d055f85ade 100644
--- a/Themes/_fallback/metrics.ini
+++ b/Themes/_fallback/metrics.ini
@@ -323,6 +323,8 @@ SaveScreenshot1=GetCodeForGame("SaveScreenshot1")
 SaveScreenshot2=GetCodeForGame("SaveScreenshot2")
 # on the player options menu.
 CancelAllPlayerOptions=GetCodeForGame("CancelAllPlayerOptions")
+# unused codes:
+Backwards=""
 # deprecated codes:
 NextTheme=""
 NextTheme2=""
@@ -2199,14 +2201,15 @@ Appearance,4="mod,blink;name,Blink"
 # Appearance,5="mod,blink;name,Blink"
 # Appearance,6="mod,randomvanish;name,R.Vanish"
 
-Turn="6;selectmultiple"
+Turn="7;selectmultiple"
 TurnDefault="mod,no turn"
 Turn,1="mod,mirror;name,Mirror"
-Turn,2="mod,left;name,Left"
-Turn,3="mod,right;name,Right"
-Turn,4="mod,shuffle;name,Shuffle"
-Turn,5="mod,supershuffle;name,SuperShuffle"
-Turn,6="mod,softshuffle;name,SoftShuffle"
+Turn,2="mod,backwards;name,Backwards"
+Turn,3="mod,left;name,Left"
+Turn,4="mod,right;name,Right"
+Turn,5="mod,shuffle;name,Shuffle"
+Turn,6="mod,supershuffle;name,SuperShuffle"
+Turn,7="mod,softshuffle;name,SoftShuffle"
 
 # Turn="6"
 # TurnDefault="mod,no turn"
diff --git a/src/CodeDetector.cpp b/src/CodeDetector.cpp
index 5630894b91..d35a3a00c2 100644
--- a/src/CodeDetector.cpp
+++ b/src/CodeDetector.cpp
@@ -23,6 +23,7 @@ const char *CodeNames[] = {
 	"ModeMenu1",
 	"ModeMenu2",
 	"Mirror",
+	"Backwards",
 	"Left",
 	"Right",
 	"Shuffle",
@@ -200,6 +201,7 @@ bool CodeDetector::DetectAndAdjustMusicOptions( GameController controller )
 			switch( code )
 			{
 			case CODE_MIRROR:			po.ToggleOneTurn( PlayerOptions::TURN_MIRROR );		break;
+			case CODE_BACKWARDS:		po.ToggleOneTurn( PlayerOptions::TURN_BACKWARDS );	break;
 			case CODE_LEFT:				po.ToggleOneTurn( PlayerOptions::TURN_LEFT );		break;
 			case CODE_RIGHT:			po.ToggleOneTurn( PlayerOptions::TURN_RIGHT );		break;
 			case CODE_SHUFFLE:			po.ToggleOneTurn( PlayerOptions::TURN_SHUFFLE );	break;
diff --git a/src/CodeDetector.h b/src/CodeDetector.h
index e636a8830c..d9b6089fbb 100644
--- a/src/CodeDetector.h
+++ b/src/CodeDetector.h
@@ -17,6 +17,7 @@ enum Code {
 	CODE_MODE_MENU1,
 	CODE_MODE_MENU2,
 	CODE_MIRROR,
+	CODE_BACKWARDS,
 	CODE_LEFT,
 	CODE_RIGHT,
 	CODE_SHUFFLE,
diff --git a/src/NoteDataUtil.cpp b/src/NoteDataUtil.cpp
index 2aeb12bc91..f8ec088a67 100644
--- a/src/NoteDataUtil.cpp
+++ b/src/NoteDataUtil.cpp
@@ -1125,6 +1125,7 @@ void NoteDataUtil::RemoveAllButPlayer( NoteData &inout, PlayerNumber pn )
 	}
 }
 
+// TODO: Perform appropriate matrix calculations for everything instead.
 static void GetTrackMapping( StepsType st, NoteDataUtil::TrackMapping tt, int NumTracks, int *iTakeFromTrack )
 {
 	// Identity transform for cases not handled below.
@@ -1208,57 +1209,61 @@ static void GetTrackMapping( StepsType st, NoteDataUtil::TrackMapping tt, int Nu
 		}
 
 		break;
+	case NoteDataUtil::backwards:
+	{
+		// If a Pump game type, treat differently. Otherwise, send to mirror.
+		bool needsBackwards = true;
+		switch (st)
+		{
+			case StepsType_pump_single:
+			case StepsType_pump_couple:
+			{
+				iTakeFromTrack[0] = 3;
+				iTakeFromTrack[1] = 4;
+				iTakeFromTrack[2] = 2;
+				iTakeFromTrack[3] = 0;
+				iTakeFromTrack[4] = 1;
+				iTakeFromTrack[5] = 8;
+				iTakeFromTrack[6] = 9;
+				iTakeFromTrack[7] = 2;
+				iTakeFromTrack[8] = 5;
+				iTakeFromTrack[9] = 6;
+				break;
+			}
+			case StepsType_pump_double:
+			case StepsType_pump_routine:
+			{
+				iTakeFromTrack[0] = 8;
+				iTakeFromTrack[1] = 9;
+				iTakeFromTrack[2] = 7;
+				iTakeFromTrack[3] = 5;
+				iTakeFromTrack[4] = 6;
+				iTakeFromTrack[5] = 3;
+				iTakeFromTrack[6] = 4;
+				iTakeFromTrack[7] = 2;
+				iTakeFromTrack[8] = 0;
+				iTakeFromTrack[9] = 1;
+				break;
+			}
+			case StepsType_pump_halfdouble:
+			{
+				iTakeFromTrack[0] = 5;
+				iTakeFromTrack[1] = 3;
+				iTakeFromTrack[2] = 4;
+				iTakeFromTrack[3] = 1;
+				iTakeFromTrack[4] = 2;
+				iTakeFromTrack[5] = 0;
+				break;
+			}
+			default:
+				needsBackwards = false;
+		}
+		if (needsBackwards) break;
+	}
 	case NoteDataUtil::mirror:
 		{
-			switch (st)
-			{
-				case StepsType_pump_single:
-				case StepsType_pump_couple:
-				{
-					iTakeFromTrack[0] = 3;
-					iTakeFromTrack[1] = 4;
-					iTakeFromTrack[2] = 2;
-					iTakeFromTrack[3] = 0;
-					iTakeFromTrack[4] = 1;
-					iTakeFromTrack[5] = 8;
-					iTakeFromTrack[6] = 9;
-					iTakeFromTrack[7] = 2;
-					iTakeFromTrack[8] = 5;
-					iTakeFromTrack[9] = 6;
-					break;
-				}
-				case StepsType_pump_double:
-				case StepsType_pump_routine:
-				{
-					iTakeFromTrack[0] = 8;
-					iTakeFromTrack[1] = 9;
-					iTakeFromTrack[2] = 7;
-					iTakeFromTrack[3] = 5;
-					iTakeFromTrack[4] = 6;
-					iTakeFromTrack[5] = 3;
-					iTakeFromTrack[6] = 4;
-					iTakeFromTrack[7] = 2;
-					iTakeFromTrack[8] = 0;
-					iTakeFromTrack[9] = 1;
-					break;
-				}
-				case StepsType_pump_halfdouble:
-				{
-					iTakeFromTrack[0] = 5;
-					iTakeFromTrack[1] = 3;
-					iTakeFromTrack[2] = 4;
-					iTakeFromTrack[3] = 1;
-					iTakeFromTrack[4] = 2;
-					iTakeFromTrack[5] = 0;
-					break;
-				}
-				default:
-				{
-					for( int t=0; t<NumTracks; t++ )
-						iTakeFromTrack[t] = NumTracks-t-1;
-					break;
-				}
-			}
+			for( int t=0; t<NumTracks; t++ )
+				iTakeFromTrack[t] = NumTracks-t-1;
 			break;
 		}
 	case NoteDataUtil::shuffle:
@@ -2332,6 +2337,7 @@ void NoteDataUtil::TransformNoteData( NoteData &nd, const PlayerOptions &po, Ste
 
 	// Apply turns and shuffles last so that they affect inserts.
 	if( po.m_bTurns[PlayerOptions::TURN_MIRROR] )			NoteDataUtil::Turn( nd, st, NoteDataUtil::mirror, iStartIndex, iEndIndex );
+	if( po.m_bTurns[PlayerOptions::TURN_BACKWARDS] )	NoteDataUtil::Turn( nd, st, NoteDataUtil::backwards, iStartIndex, iEndIndex );
 	if( po.m_bTurns[PlayerOptions::TURN_LEFT] )			NoteDataUtil::Turn( nd, st, NoteDataUtil::left, iStartIndex, iEndIndex );
 	if( po.m_bTurns[PlayerOptions::TURN_RIGHT] )			NoteDataUtil::Turn( nd, st, NoteDataUtil::right, iStartIndex, iEndIndex );
 	if( po.m_bTurns[PlayerOptions::TURN_SHUFFLE] )			NoteDataUtil::Turn( nd, st, NoteDataUtil::shuffle, iStartIndex, iEndIndex );
diff --git a/src/NoteDataUtil.h b/src/NoteDataUtil.h
index 167d2955f7..3aef94ca1a 100644
--- a/src/NoteDataUtil.h
+++ b/src/NoteDataUtil.h
@@ -111,7 +111,20 @@ namespace NoteDataUtil
 	void RemoveStretch( NoteData &inout, StepsType st, int iStartIndex = 0, int iEndIndex = MAX_NOTE_ROW );
 	void RemoveAllButOneTap( NoteData &inout, int row );
 	void RemoveAllButPlayer( NoteData &inout, PlayerNumber pn );
-	enum TrackMapping { left, right, mirror, shuffle, soft_shuffle, super_shuffle, stomp, NUM_TRACK_MAPPINGS };
+	/** @brief The types of transformations available for the NoteData. */
+	enum TrackMapping
+	{
+		left, /**< The NoteData is arranged as if the player was facing to the left. */
+		right, /**< The NoteData is arranged as if the player was facing to the right. */
+		mirror, /**< The NoteData is arranged as if facing a straight mirror. */
+		backwards, /**< The NoteData is arranged as if the player was facing backwards.
+					This is NOT always the same as mirror. */
+		shuffle,
+		soft_shuffle,
+		super_shuffle,
+		stomp,
+		NUM_TRACK_MAPPINGS
+	};
 	void Turn( NoteData &inout, StepsType st, TrackMapping tt, int iStartIndex = 0, int iEndIndex = MAX_NOTE_ROW );
 	void Little( NoteData &inout, int iStartIndex = 0, int iEndIndex = MAX_NOTE_ROW );
 	void Wide( NoteData &inout, int iStartIndex = 0, int iEndIndex = MAX_NOTE_ROW );
diff --git a/src/PlayerOptions.cpp b/src/PlayerOptions.cpp
index 68239afa33..914178a8a2 100644
--- a/src/PlayerOptions.cpp
+++ b/src/PlayerOptions.cpp
@@ -195,6 +195,7 @@ void PlayerOptions::GetMods( vector<RString> &AddTo, bool bForceNoteSkin ) const
 	AddPart( AddTo, m_fRandomSpeed,	"RandomSpeed" );
 
 	if( m_bTurns[TURN_MIRROR] )		AddTo.push_back( "Mirror" );
+	if( m_bTurns[TURN_BACKWARDS] )		AddTo.push_back( "Backwards" );
 	if( m_bTurns[TURN_LEFT] )			AddTo.push_back( "Left" );
 	if( m_bTurns[TURN_RIGHT] )			AddTo.push_back( "Right" );
 	if( m_bTurns[TURN_SHUFFLE] )		AddTo.push_back( "Shuffle" );
@@ -389,6 +390,7 @@ bool PlayerOptions::FromOneModString( const RString &sOneMod, RString &sErrorOut
 	else if( sBit == "randomvanish" )			SET_FLOAT( fAppearances[APPEARANCE_RANDOMVANISH] )
 	else if( sBit == "turn" && !on )			ZERO( m_bTurns ); /* "no turn" */
 	else if( sBit == "mirror" )				m_bTurns[TURN_MIRROR] = on;
+	else if( sBit == "backwards" )			m_bTurns[TURN_BACKWARDS] = on;
 	else if( sBit == "left" )				m_bTurns[TURN_LEFT] = on;
 	else if( sBit == "right" )				m_bTurns[TURN_RIGHT] = on;
 	else if( sBit == "shuffle" )				m_bTurns[TURN_SHUFFLE] = on;
@@ -963,6 +965,7 @@ public:
 
 	// Turns
 	DEFINE_METHOD( GetMirror, m_bTurns[PlayerOptions::TURN_MIRROR] )
+	DEFINE_METHOD( GetBackwards, m_bTurns[PlayerOptions::TURN_BACKWARDS] )
 	DEFINE_METHOD( GetLeft, m_bTurns[PlayerOptions::TURN_LEFT] )
 	DEFINE_METHOD( GetRight, m_bTurns[PlayerOptions::TURN_RIGHT] )
 	DEFINE_METHOD( GetShuffle, m_bTurns[PlayerOptions::TURN_SHUFFLE] )
@@ -1088,6 +1091,7 @@ public:
 
 		// Turns
 		ADD_METHOD( GetMirror );
+		ADD_METHOD( GetBackwards );
 		ADD_METHOD( GetLeft );
 		ADD_METHOD( GetRight );
 		ADD_METHOD( GetShuffle );
diff --git a/src/PlayerOptions.h b/src/PlayerOptions.h
index 0166af9c4e..d3292d1280 100644
--- a/src/PlayerOptions.h
+++ b/src/PlayerOptions.h
@@ -109,6 +109,7 @@ public:
 	enum Turn {
 		TURN_NONE=0, /**< No turning of the arrows is performed. */
 		TURN_MIRROR, /**< The arrows are mirrored from their normal position. */
+		TURN_BACKWARDS, /**< The arrows are turned 180 degrees. This does NOT always equal mirror. */
 		TURN_LEFT, /**< The arrows are turned 90 degrees to the left. */
 		TURN_RIGHT, /**< The arrows are turned 90 degress to the right. */
 		TURN_SHUFFLE, /**< Some of the arrow columns are changed throughout the whole song. */
diff --git a/src/ScreenEdit.cpp b/src/ScreenEdit.cpp
index c6f947008b..9d5cf5c843 100644
--- a/src/ScreenEdit.cpp
+++ b/src/ScreenEdit.cpp
@@ -549,7 +549,7 @@ static MenuDef g_AlterMenu(
 	      EditMode_Practice, true, true, 0, 
 	      "4th","8th","12th","16th","24th","32nd","48th","64th","192nd"),
    MenuRowDef(ScreenEdit::turn,				"Turn",					true, 
-	      EditMode_Practice, true, true, 0, "Left","Right","Mirror","Shuffle","SuperShuffle" ),
+	      EditMode_Practice, true, true, 0, "Left","Right","Mirror","Backwards","Shuffle","SuperShuffle" ),
    MenuRowDef(ScreenEdit::transform,			"Transform",				true, 
 	      EditMode_Practice, true, true, 0, "NoHolds","NoMines","Little","Wide",
 	      "Big","Quick","Skippy","Mines","Echo","Stomp","Planted","Floored",
@@ -3986,6 +3986,7 @@ void ScreenEdit::HandleAlterMenuChoice(AlterMenuChoice c, const vector<int> &iAn
 				case left:		NoteDataUtil::Turn( m_Clipboard, st, NoteDataUtil::left );		break;
 				case right:		NoteDataUtil::Turn( m_Clipboard, st, NoteDataUtil::right );		break;
 				case mirror:		NoteDataUtil::Turn( m_Clipboard, st, NoteDataUtil::mirror );		break;
+				case turn_backwards:		NoteDataUtil::Turn( m_Clipboard, st, NoteDataUtil::backwards );		break;
 				case shuffle:		NoteDataUtil::Turn( m_Clipboard, st, NoteDataUtil::shuffle );		break;
 				case super_shuffle:	NoteDataUtil::Turn( m_Clipboard, st, NoteDataUtil::super_shuffle );	break;
 			}
diff --git a/src/ScreenEdit.h b/src/ScreenEdit.h
index 0749344f05..bb68c9d523 100644
--- a/src/ScreenEdit.h
+++ b/src/ScreenEdit.h
@@ -456,7 +456,8 @@ public:
 	{
 		left, /**< Turn the notes as if you were facing to the left. */
 		right, /**< Turn the notes as if you were facing to the right. */
-		mirror, /**< Turn the notes as if you were facing away from the machine. */
+		mirror, /**< Flip the notes vertically. */
+		turn_backwards, /**< Turn the notes as if you were facing away from the machine. */
 		shuffle, /**< Replace one column with another column. */
 		super_shuffle, /**< Replace each note individually. */
 		NUM_TURN_TYPES