Iria

Multiwinia is a stand-alone multiplayer skirmish game based on Introversion's 2003 release of Darwinia. Fans of this sleeper title might not have expected a sequel from the developer, one that tends to shy away from rehashes and instead focus on entirely new games. While Darwinia has a lengthy single player campaign, it lacks any kind of multiplayer. So, Multiwinia combines the action elements from Darwinia with six multiplayer gametypes.
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Source: Atomic Gamer