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Bastion is great if you haven't played it yet, that's basically required reading for a gamer IMO Dota 2 has been ported, and is free, but if you're not already into MOBAs it will be a time investment learning about it. If you haven't played Psychonauts yet, grab that. I recommend a controller for this one, USB 360 controllers are godly and work great in Linux. I also second the suggestion of Dwarf Fortress, it won't tell you outright but you'll need ia32-libs for it to work right if you're on x64.