Inspired by the classic arcade game Mario Bros., players must help Mario as he clears various floors/stages of a building, each filled with nasty creatures.
The aim of the game is to clear all of the enemies from all 40 floors of the building. Enemies are cleared by knocking them down or by throwing a Koopa Shell at them. The stages are split up into foreground and background areas, and where shells can be thrown at enemies across the gaps.