Prepare to feel old: Quake III Arena came out nearly ten years ago. Prepare to feel young again: Quake Live can be played in your browser for free. The long-anticipated beta opened to the public yesterday. John Carmack says that they hope to be improving and polishing the game for the next decade. [more inside]
posted by Plutor on Feb 25, 2009 - 50 comments

A novel youtube page promoting Nintendo's latest platform game. The page itself adds context as the video progresses.
posted by nthdegx on Oct 8, 2008 - 24 comments

Monster's Den: Book of Dread might be the best free dungeon crawl RPG on the web. If it ain't, it's damned close. [more inside]
posted by chuckdarwin on May 14, 2008 - 30 comments

Ajax your chess experience up with 64squar.es.
posted by boo_radley on Jul 12, 2007 - 23 comments

Get Hostile! - Inspired by the well-beloved Avalon Hill board game Acquire, Get Hostile! is a free, web-based board game that has already sucked up hours of my time. Check out the quick tutorial to get up to speed, then play against live opponents or AI's, forming corporations, buying stock, and doing hostile takeovers!
posted by ikkyu2 on Feb 1, 2007 - 11 comments

Draw one to get one Nice little site that lets you exchange online drawings with anonymous people.
posted by jeremias on Feb 11, 2006 - 22 comments

prognosticate :: use your powers of deduction to predict what happens next in today's news stories
posted by anastasiav on Jun 22, 2005 - 7 comments

Go problems database with a slick web interface. Go is one of the most rewarding games I've ever played. You can play games at ItsYourTurn.com, who also have a nice rule summary.
posted by freebird on Jun 1, 2005 - 14 comments