Users Playing this game are also playing:

Left 4 Dead 2
Left 4 Dead 2
Half-Life 2
Half-Life 2
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Half-Life: Desert Crisis
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Gears of War

Users who own this game also own:

Portal
Portal
AudioSurf
AudioSurf
Portal 2
Portal 2
Left 4 Dead 2
Left 4 Dead 2
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Super Meat Boy

Users who love this game also love:

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America's Army: Rise of a Soldier