Adrian Hon recently posted about a mind-bending little dice puzzle called Petals Around the Rose. It’s a damned brain-melter, for some people: he figured it out in a few minutes, but as I mentioned in the comments on his site, I gave up after half an hour and looked up a cheat. Bad me, but when I saw the cheat I knew I wouldn’t have thought of the solution for weeks, if ever, at least not using dice online. (Don’t be fooled, the straight line pattern you see on the simulators is not necesary or important.)
If you want to try the game, go for it, but be warned, it could drive you bonkers. They say the smarter you are, the harder it is for you to figure out.