Fire up your brain, and get to the bottom of these ingenious and confounding puzzles! While you can do these alone, you might invite your friends and make it a game. One person acts as a quiz master, looking at the clues and solutions in advance and answering questions. Start with the easier warm-up puzzles, then move on to workout, strenuous, and super-strenuous ones. Other puzzles use visual clues, and after each grouping there's a fun-filled, timed set of ten quick questions designed to trick you!