You are a clown who moves around a maze. You can dig new paths to avoid monsters and collect cherries. Kill monsters with a 'powerball' or drop apples on them. Kill them all or eat all the cherries to go up a level.
There are multiple versions of the PCB in existence, the first PCB (8201) required a separate sound amplifier, another (MRD-1102) had an on-board amplifier and volume control. On both board versions, the audio output appears on the same two pins (L and M).