'Bonk' is a cave-boy who battles anthropomorphic dinosaurs and other prehistoric themed enemies. Bonk's mission is to rescue 'Princess Za' (a small pink Pleisiosaur-type reptile) who has been kidnapped by the evil 'King Drool' (a large, green, Tyrannosaurus-type dinosaur). Bonk attacks enemies by "bonking" them with his large, invincible forehead. Bonk starts the game with three hearts' worth of health, which are depleted to blue as Bonk takes damage, and three extra lives. Bonk's health can be restored in increments by collecting fruits and vegetables.