■ If had been created in Derby then it would have looked like . As you might have guessed, the player character Chuck Rock chucks rocks, and by doing so he can dispatch prehistoric opponents. But he can also hold rocks above his head to give him protection from aerial foes and projectiles, or jump off them onto high-up ledges. Half the fun is experimenting to see what you can do with the rocks, and how they might help you survive Chuck’s Stone-Age world.