Not a game as such, but Garry's Mod is vital for H-L2 owners. This constantly evolving work lets you spawn any object or character from H-L2 or Counter-strike, then weld, pose, set fire to, color, magnetize and add balloons or wheels (and a great deal more). Other peoples' creations can be downloaded, too. It's hilarious.
Above: This, a floating bed or a fully-functioning, five-story robot on fire - anything is possible
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