You pick a dinosaur – carnivore, herbivore or speedy (it doesn't seem to matter which type) – and begin trudging slowly across a map, seeking out the marked objectives, which seem to consist only of locating fossils (time paradox alert!) and beating other dinosaurs to death for golden eggs. With the level complete, you go to the next area, which is exactly the same.
Battles are a massive disappointment. You are 'challenged' to trace over a shape on the touch screen. Do a good job, you attack first. Do a bad job and you'll still win, because it's very hard to lose at this game.