The central character in this game is a mouse called Cheesy, who is trapped inside Dr Chem's castle where he must walk the treadmill to provide power for the mad scientist's genetic experiments.[4]
However, aliens attack the castle and in the commotion Cheesy escapes. Cheesy has to navigate through 24 levels and fight mutated creatures, huge spiders, balance a minecart through derelict tracks and escape flames inside a burning chimney.[1]
Each level is accessed from a central chamber that has various doors and openings that lead to different sections of the castle. The chimney will lead to the castle's roof while the drains will take Cheesy into piranha-infested sewers.[4]
The gameplay is similar to that of Spider: The Video Game[5] and involves an element of puzzle solving, timed jumps over flaming pits, bouncing off enemies to land on previously unreachable platforms and a fair bit of gun-toting.[4]