diff -ur xmoto-0.5.2/src/Input.cpp xmoto-0.5.2-matrix/src/Input.cpp
--- xmoto-0.5.2/src/Input.cpp	2008-12-15 21:29:39.000000000 +0100
+++ xmoto-0.5.2-matrix/src/Input.cpp	2009-08-27 19:48:40.000000000 +0200
@@ -308,6 +308,10 @@
     m_switchFavorite     = XMKey(SDLK_F3, KMOD_NONE);
     m_restartLevel       = XMKey(SDLK_RETURN,   KMOD_NONE);
     m_showConsole        = XMKey(SDLK_WORLD_18, KMOD_NONE);
+   
+    /* matrix mod by [exa] */
+    m_matrixMore         = XMKey(SDLK_F4, KMOD_NONE);
+    m_matrixLess         = XMKey(SDLK_F6, KMOD_NONE);
   }  
 
   /*===========================================================================
diff -ur xmoto-0.5.2/src/Input.h xmoto-0.5.2-matrix/src/Input.h
--- xmoto-0.5.2/src/Input.h	2008-12-15 21:29:39.000000000 +0100
+++ xmoto-0.5.2-matrix/src/Input.h	2009-08-27 19:51:08.000000000 +0200
@@ -132,6 +132,11 @@
   XMKey m_switchFavorite;
   XMKey m_restartLevel;
   XMKey m_showConsole;
+
+  /* matrix mod by [exa] */
+ public:
+  XMKey m_matrixMore;
+  XMKey m_matrixLess;
 };
 
 
diff -ur xmoto-0.5.2/src/states/StateScene.cpp xmoto-0.5.2-matrix/src/states/StateScene.cpp
--- xmoto-0.5.2/src/states/StateScene.cpp	2009-01-13 23:10:37.000000000 +0100
+++ xmoto-0.5.2-matrix/src/states/StateScene.cpp	2009-08-27 20:22:41.000000000 +0200
@@ -19,6 +19,7 @@
 =============================================================================*/
 
 #include "StateScene.h"
+#include "SysMessage.h"
 #include "../PhysSettings.h"
 #include "../xmscene/Camera.h"
 #include "../XMSession.h"
@@ -59,6 +60,8 @@
   m_cameraAnim = NULL;
   m_universe   = NULL;
 
+  m_matrix     = 1;
+
   m_benchmarkNbFrame   = 0;
   m_benchmarkStartTime = GameApp::getXMTime();
 
@@ -168,24 +171,25 @@
 
   try {
     int nPhysSteps = 0;
+    float matrixed_slice=100.0/m_matrix;
     
     if(isLockedScene() == false) {  
       // don't update if that's not required
       // don't do this infinitely, maximum miss 10 frames, then give up
       // in videoRecording mode, don't try to do more to allow to record at a good framerate
-      while (( m_fLastPhysTime + (PHYS_STEP_SIZE)/100.0 <= GameApp::getXMTime()) && nPhysSteps < 10 && (XMSession::instance()->enableVideoRecording() == false || nPhysSteps == 0)) {
+      while (( m_fLastPhysTime + (PHYS_STEP_SIZE)/matrixed_slice <= GameApp::getXMTime()) && nPhysSteps < 10 && (XMSession::instance()->enableVideoRecording() == false || nPhysSteps == 0)) {
 	if(m_universe != NULL) {
 	  for(unsigned int i=0; i<m_universe->getScenes().size(); i++) {
 	    m_universe->getScenes()[i]->updateLevel(PHYS_STEP_SIZE,
 						    m_universe->getCurrentReplay(), m_universe->getCurrentReplay());
 	  }
 	}
-	m_fLastPhysTime += PHYS_STEP_SIZE/100.0;
+	m_fLastPhysTime += PHYS_STEP_SIZE/matrixed_slice;
 	nPhysSteps++;
       }
       
       // if the delay is too long, reinitialize
-      if(m_fLastPhysTime + PHYS_STEP_SIZE/100.0 < GameApp::getXMTime()) {
+      if(m_fLastPhysTime + PHYS_STEP_SIZE/matrixed_slice < GameApp::getXMTime()) {
 	m_fLastPhysTime = GameApp::getXMTime();
       }
       
@@ -301,6 +305,25 @@
     }
   }
 
+  /* matrix mod by [exa] */
+
+  else if(i_type == INPUT_DOWN && i_xmkey == InputHandler::instance()->m_matrixLess) {
+    char buf[256];
+    m_matrix -= 1;
+    if (m_matrix<1) m_matrix=1;
+    sprintf(buf,"Matrix Lowered to 1:%d",m_matrix);
+    SysMessage::instance()->displayText(buf);
+  }
+  else if(i_type == INPUT_DOWN && i_xmkey == InputHandler::instance()->m_matrixMore) {
+    char buf[256];
+    m_matrix += 1;
+    if (m_matrix>20) m_matrix=20;
+    sprintf(buf,"Matrix Increased to 1:%d",m_matrix);
+    SysMessage::instance()->displayText(buf);
+  }
+
+  /* end of matrix mod */
+
   else if(i_type == INPUT_DOWN && i_xmkey == InputHandler::instance()->getSwitchBlacklist()) {
     if(m_universe != NULL) {
       if(m_universe->getScenes().size() > 0) { // just blacklist the first world
diff -ur xmoto-0.5.2/src/states/StateScene.h xmoto-0.5.2-matrix/src/states/StateScene.h
--- xmoto-0.5.2/src/states/StateScene.h	2008-11-23 10:30:46.000000000 +0100
+++ xmoto-0.5.2-matrix/src/states/StateScene.h	2009-08-27 20:05:00.000000000 +0200
@@ -79,6 +79,9 @@
 
  Universe* m_universe;
 
+ /* matrix mod by [exa] */
+ int m_matrix;
+
  int m_benchmarkNbFrame;
  float m_benchmarkStartTime;