10. Spore
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Sims creator Will Wright spent seven years writing, researching and designing this evolutionary epic, which may well be the most ambitious game ever made. Spore follows the history of a single species, designed by you, from a cute little single cell up through sentience, civilization and finally space exploration. The innovation here doesn't lie in the gameplay, which is merely entertaining, but in the sophistication of the animations that make your creation walk and move and dance, and in the game's hubristic, near-infinite scope.

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