92 years young, the delightful Raymond Smullyan is a mathematician, logician, magician, concert pianist, and Taoist philosopher - who also pioneered retrograde chess problems.
posted by Trurl on Jun 26, 2011 - 22 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

Interactive Philosophy Games :: Construct a God, explore your morals, take a new look at what it means to be alive, plus Shakespeare vs. Britney Spears. Or, you can just read it for the articles.
posted by anastasiav on May 10, 2004 - 13 comments

Timehunt. Time, philosophy, alchemy, tons of interactive puzzles and great flash. I can't tell you more, I'm still figuring it out.
posted by talos on Oct 16, 2002 - 9 comments