Both Left 4 Dead 2 and Garry's Mod are currently on sale, but I can only get one. I mainly just want Garry's Mod for the mods/game modes that require it. (ie. Trouble in Terrorist Town, Morbus, ect.)
I have over 117 hours in the game. :P Can't remember which hours are for campaign and which is for community puzzles, but I think I beat the campaign over 10 times.