Spore

Spore is, at first glance, an evolution game: the player molds and guides a creature across many generations of evolution, until it becomes intelligent, at which point, the scope of the game expands to encompass a broader range of social evolution. This is achieved by first giving the player control over a lone creature (designed by the player him/herself) until the creature begins a tribe of his own, at which point a tribal real-time strategy aspect is incorporated into the game by war with other tribes. The player then begins molding and guiding his creature's society into a space-faring civilization, where the player and his creatures begin to colonize other planets and eventually control a galactic empire.

Links

 * SporeWiki