I don't know where to find a general place of more puzzles like this, but here's one I enjoyed: http://www.xkcd.com/blue_eyes.html http://www.xkcd.com/blue_eye

I don't know where to find a general place of more puzzles like this, but here's one I enjoyed: http://www.xkcd.com/blue_eyes.html http://www.xkcd.com/blue_eyes.html