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Gears of War 2's single-player campaign has been given a lot of attention leading up to the title's November 7 release. And deservedly so. Still, it's important to remember that while the single-player is what initially draws players into the Gears universe, it's the multiplayer that keeps that disc spinning for months and years to come. Gears of War 2 is changing the face of the series' multiplayer with a new co-op mode called Horde.
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Source: IGN

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