Smart thinking--but not straight thinking. To crack these brain-testing puzzles you can't go for the obvious: instead, be a little "twisted" and look at the problem from a new perspective. Most are in the form of tricky little mysteries...and you won't rest till you've figured them out. The strange situations will test your assumptions, open your mind, and encourage creative questioning. Try this to see what they're like: A foreign visitor to London wanted to ride up the escalator at the subway station, but did not do so. Why? Could you guess the reason is that he saw a sign saying "Dogs must be carried"--and he didn't have a dog! At first, it you may think you don't have all the information needed to arrive at the answers--but persist and you'll solve them all. Don't worry: in case you need some help, there's a clues page!