Repost from my blog at http://personal.x-istence.com/node/106 : Mensa is a body of people that are supposedly geniuses, there is an awesome test available online at http://mensa-test.com/. It has been said that only two members of Mensa have been able to get all of them, however I think the test must have been quite a bit harder when they took it, because I got 31 out of 33 correct answers so far. There is some cultural bias, especially with regards to one of them which involves the US flag, and the 13 stripes that it contains. I was up from 2200 hours EST Thursday till 0300 hours EST Friday to try and figure as many as possible out. I had figured out 29, one with the help of a friend, since I had no clue the American flag had 13 stripes. Since then I have gotten 2 more, and am since then at 31 correct out of 33. If people ask, I will post answers, however I don't think it fair to post them now, because that would cause people to cheat. The numbers I can't figure out: 28, and 30. Good luck! Update: Got number 28. That one is fairly hard.