for the strange IQ quizzes I can remember: 1. give you two ropes that burns out in one hour, how do you get 45 min precisely from burning them? 2. two gates two guards, one telling truth, one telling lies, how to ask one guard one question so that it leads to treasure; 3. zebra puzzle (they basically have an identical problem listed in the wiki of zebra puzzle but with details changed); 4. 10 piles candies, 9 piles weigh 1 g each, one pile weigh 2 g, how to use scale to find out which one weighs 2 g, and two more upgraded question like x piles weigh 1 g, y piles weigh 2 g, x + y = 10, how do you find 1 g piles.
