Don't think too hard or you'll never solve these logic puzzles and riddles. The answers to all 187 are easy once you catch the tricky wording. How can you tie a

FLEX YOUR brain power like never before! From acclaimed author Dr. Gary Gruber, whose proven critical-thinking methods have sold more than seven million books,

To solve these inventive brainteasers, your brain has to be in tip-top shape. Warm up with some (slightly) easier puzzles: beginning in the left corner of a box

Solve it like Sherlock: Generations of readers have made Sherlock Holmes the world's most famous fictional detective. Now, you have a chance to test your mettle

60-Second Brain Teasers Pencil-Free Puzzles contains 201 no-pencil-required brain twisters that take one minute or less. These completely original puzzles range