Build and maintain your tribes village. You begin with a small group of villagers, whom you can assign tasks such as gathering foodstuffs and building materials, to harvest, hunt, fish, cook etc. Tribesmen also have minds of their own, when not performing tasks, they will wander around, eat, sleep, gather flowers or just chat to their fellow cavemen.
You are responsible for the work/life balance of your tribes people. During “freetime”, they can fall in love with one another and even produce offspring!