diff --git a/game.cpp b/game.cpp
index d5784d7..c967b26 100644
--- a/game.cpp
+++ b/game.cpp
@@ -767,6 +767,8 @@ inline void pixelFunc(PixelInfo pixel)
 
 unsigned short pal[256];
 
+Unit shear = 0;
+
 void draw()
 {
   RayConstraints c;
@@ -775,7 +777,7 @@ void draw()
   c.maxSteps = 10;
   c.computeTextureCoords = 1;
 
-  render(player.mCamera,floorHeightAt,ceilingHeightAt,textureAt,pixelFunc,c);
+  render(player.mCamera,floorHeightAt,ceilingHeightAt,textureAt,pixelFunc,c,shear);
 
   Unit previousDepth;
 
@@ -868,11 +870,14 @@ int main()
       }
 
       bool strafe = p.aBtn();
+      bool lookUpDown = p.cBtn();
 
       if (p.upBtn())
       {
         if (strafe)
           heightOffset = step;
+        else if (lookUpDown)
+          shear = min(shear + 100, 2 * UNITS_PER_SQUARE);
         else
           moveOffset = d;
       }
@@ -880,6 +885,8 @@ int main()
       {
         if (strafe)
           heightOffset = -step;
+        else if (lookUpDown)
+          shear = max(shear - 100, -2 * UNITS_PER_SQUARE);
         else
         {
           moveOffset.x = -1 * d.x;
@@ -887,6 +894,9 @@ int main()
         }
       }
 
+      if (!lookUpDown)
+        shear = shear / 2;
+
       int addition = 0;
 
       if (p.rightBtn())
@@ -904,7 +914,7 @@ int main()
       }
       else
         player.mCamera.direction += addition * step2;
-      
+    
       moveCameraWithCollision(&player.mCamera,moveOffset,heightOffset,
         floorHeightAt, ceilingHeightAt);
     }