The object of the game is to collect the eggs of five dinosaur and flying reptile species and deposit them in time portals to the future in twenty minutes; at the end of the countdown, the asteroid that caused the Cretaceous-Paleogene extinction event hits Earth.
The native animals will attack the Nanosaur when their eggs are threatened; species encountered include Tyrannosaurus Rex, Stegosaurus, Triceratops, Dilophosaurus (who spits like in Jurassic Park), and the flying reptile Pteranodon.