I just read the rules for the uber challenge for OoT. That sounds like a very frustrating way to play the game. I don't think my controller would have remained in one piece had I attempted it!

I'm not really the sort of person to do self-imposed challenges per se. Sometimes I'll give myself tasks to do like sequence breaking in Metroid games though. The one challenge of sorts I do insist on is allowing no character deaths when I play a Fire Emblem game, irrespective of how useless a particular character may be!