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Day of Defeat: Source
A remake of an old mod for the original Half-Life, this excellent online WWII shooter looks and plays better than ever using Valve's lovely Source engine. It's team-based (though you can just join a side - you don't need to arrange one), death can come quickly and it's claustrophobic. Exhilarating.

Above: You won't kill many, but at least you can dig your own grave as you fall

Above: You won't kill many, but at least you can dig your own grave as you fall