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Darwinia
Darwinia is a fantastically original-looking strategy with an original premise - the Darwinians are artificial lifeforms developed inside a computer, and they're under attack by a virus. It's up to the player to beat the virus... Nothing to do with Source, this critically acclaimed title just impressed Valve into publishing it.

Above: The stylised graphics and intriguing setup are just part of this game's appeal

Above: The stylised graphics and intriguing setup are just part of this game's appeal