Use the space key to shoot and the arrow keys to move. So far there are 5 modes: Normal, Space Normal, Run. Space run and Bridges. use numbers 1 2 3 4 and 5 to change modes. In the Run versions you do not have any bullets, you have to force the enemy to shoot itself. The Bridges version is very hard. you must stay out of the lava while the big green tank goes through it. and defeat it before you fall in.
ai often shoots himself :(
