This on-line game lets you free a mammoth from the ice, create fire and invent the wheel, all with a time limit. Needless to say I was too slow to achieve anything!
Short History of the World – Online games for free
Seriously though, I’m sure that games are a great way to learn and would love to have time to develop a history of the universe game, but I know I never will.
Completing Time Crystal is about as much as I can ever hope to do, but it could easily form the kernel of a game.