The best zombie game ever is less than $1 on Steam
Ever wondered if you'd survive an undead apocalypse? Going by Left 4 Dead, the answer is probably no. But this co-op zombie shooter is so brilliant and unpredictable, even getting punched off the side of a building is a blast. And right now, you can get Left 4 Dead and Left 4 Dead for less than $1 / £1 each.
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Snag basically every Valve game for an unreal 96% off