Use Walter Detonator to detonate the bombs. The goal is to detonate all the bombs in the field without blowing Walter himself to bits or falling off the playing field. Leave the right tiles for Walter to get to other bombs and to stand clear of the explosions on when bombs explode.
The controls are tricky at first, because they work on the basis of the North=Up indication instead of which way Walter and the field are turned. Once played they are easy to get the hang of though.
Use the arrow keys to move and space to detonate bombs.