i got to level 12 before reading this, which of the 3 buttons is it?
BTW, another way to do it without using that ATI mouse is to just resize your browser window so that there aren't any edges to the game, which will let you move your mouse out of the game "window" (so that you can see it and move it around without touching the black walls, then resize it as necessary to get to the buttons without touching the walls.