World of Goo... where to begin. World of Goo is a puzzle/physics game that is incredibly addicting. You use your goo balls to advance through levels, making towers of goo to reach your goal. Each level is unique and my friend tells me this game was created by two ex-EA employees. It's a perfect game to play maybe when the Den is down, or just for some fun. You'll have to check it out for yourself, here are three links, one for the site to the game, one to a free download of the game that someone put on RapidShare, and another of a site where people create there own levels so you can put them in to your game and it also has a tool where you can make your own. If the free download isn't working for some reason, you can pick it up from steam for a measly 8 dollars and maybe from some other place for around there.
2D Boy: I love you, 2D Boy!
RapidShare: Easy Filehosting
GooFans | Levels and mods for the World of Goo
Enjoy!