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From Evolution to Advanced Civilization. Yes, this game is just that big.
Quite frankly, I find it really difficult to describe what Spore means for the future of games. It suffices to say that Spore is a game that very few developers would dream of trying; The game is absolutely HUGE! Essentially, it demonstrates that the near impossible, at least in developing games, is still possible. Just think of the possibilities if they worked this same idea into a full-blown MMO.
If you haven't tried it yet, I do recommend picking it up. It is quite addictive.

Och, I love Spore! The flexibility of essentially becomming God ^^
Finally hit Omnipotent then decided to uninstall due to Disk Space :S
Just *cough* watch out for said robotic monkeys nearby....