Citizen Able Gravity Bone. One of the greatest gaming experiences of my life so far. Its a short 10 minute game that you should download now, its free and there's a sequel in the works. Hopefully this one is longer.
Its for windows it's a standalone mod for unreal tournament 3, which basically means it doesn't need the game to be played. http://blendogames.com/files/gravitybone_v11.zip
Final Fantasy X-2, yes, I beat this game in a weekend...whilst playing casually. In terms of being the shortest game overall, I wasn't used to an RPG being so easy to beat. I know this is off-topic in a way, but, if I tried beating a Golden Sun in a weekend, I probably would've probably not slept. I really adore Camelot as a developer. They have made some of the games which brought Nintendo to the plateau they sit at today. If you look at this wiki you will see what I mean: http://en.wikipedia....ftware_Planning