The Gedanken Institute Book of Puzzles

This 180-page book contains 136 pages of puzzles and 44 pages of solutions.  The puzzles were collected from the many, many years of  Gedanken Institutes for Problem Solving.

There are many original problems and detailed, well-explained solutions.  There are a wide range of types of problems, making it a great companion on a long plane ride for all levels and types of problem solvers.

Available at Amazon.