One player controls the Overseer, directing the monsters of the catacomb. The other player(s) control the party of four heroes who cooperatively try to defeat the monsters and eventually the Catacomb Lord. Each of the heroes' special abilities must also be used effectively if they are to prevail. The main mechanic of Catacombs is for the players to flick wooden discs representing monsters, heroes, missiles and fireballs. Contact with an opposing piece inflicts damage but stun, poison, critical and other shot modifiers can create other effects.