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 from easy to near-impossible! Illustrations: color illustrations.
Elefant
Fair Winds Press 60-second brain teasers pencil-free puzzles. short head-scratchers from the easy to near impossible, paperback/nathan haselbauer