Fire Ball is another of Hudson Soft's bouncy-ball based games. In this one, you first climb the ladder so you can shoot the bouncing fireball, which causes it to split into mini fireballs. Then your task is to destroy them, which is where the unique game mechanic comes into play.

You have to trap them in the lower half of the screen, but to accomplish this, you have to walk over the ceiling to close it off. You can't decide on a section-by-section basis which are opened and which are closed, though. Walking over a gap from left to right causes it to close, and going right to left causes it to open again. Then you stamp on the floor to activate a (freeze?) beam, which destroys it. Doesn't sound that difficult on paper, but it's a pretty hard game! It took me SO long to progress to level 2.