anchor.diff:      0= if
           die
       then
  -
  -\   if ((time == 0) && (dying == 0))
  -\     dying = 1;
  -\  
  -\   // Draw 'time remaining' by clearing a black rectangle
  -\   {
  -\     byte tw = 120 - (time >> 7);
  -\     byte tx = 72;
  -\     GD.SaveContext();
  -\     GD.ScissorXY(tx, 248);
  -\     GD.ScissorSize(tw, 8);
  -\     GD.Clear();
  -\     GD.RestoreContext();
  -\   }
   
       GD.SaveContext
       72 248 GD.ScissorXY
  
positive.code:     GD.RestoreContext
  
      1 GD.TagMask
  
  \   GD.TagMask(1);
  \ 
  \   // player control.  If button pressed, start the 'leaping' counter
  \   byte con = Control.read();
  
      depth throw
  
  
negative.code:             then
          then
      then
  ;
  
  : frogger
      GD.init
  