60-Second Brain Teasers Pencil-Free Puzzles : Short Head-Scratchers from the Easy to Near Impossible At your home, on the commuter train, or in your doctor's office—whenever you have a minute or two, challenge your brain with these ingenious brainteasers! Nathan Haselbauer's amazingly clever book of 201 pencil-free brain teasers isn't your typical puzzle book. 60-Second Brain Teasers Pencil-Free Puzzles is the perfect distraction for puzzle lovers with only a few minutes to spare. Puzzles include gems such as this one: If Beth is as old as Bill will be when Trish is as old as Beth is now, who is the oldest? Hours of mind-bending entertainment await you, from math and logic puzzles to word games!(This book may contain a sharpie mark on the top or bottom edge and may show mild signs of shelfwear.)