Some dinosaurs will assist Chuck, such as the brontosaurus that helps Chuck across a swamp, although almost all dinosaurs encountered will attack Chuck. The game was notable for the major form of defense, which was to belly bounce with Chuck's beer belly, and for the catchphrase "unga bunga!"which was shouted by Chuck at the start of each level. Alternatively the character could pick up and "chuck" rocks at opponents. There is also a puzzle element to the game, as certain rocks are used to reach high areas. Health is indicated by the size of a heart icon. Health and score can be raised by finding dinosaur steaks and eating them. There is a boss at the end of each level.