A cartridge game for the Commodore Vic 20. You are a blue rat who has to run around a maze and avoid the badass red rats. You can spit a magic cloud of dust out yer ass if they're tailin' ya. Watch out for the stationary but ruthless black cats. You also have a little radar view of the entire map and position of the red rats to help you.
The object of the game is (you guessed it) to eat all the cheese.