1.
Giant Book of Hard-to-Solve Word Puzzles/Giant Book of Hard-to-Solve Mind Puzzles: Flip Book
by Kurchan, Rodolfo, Niederman...
ISBN: 9781402702853
List Price: $9.98
2.
Mesmerizing Math Puzzles: Official American Mensa Puzzle Book
by Kurchan, Rodolfo
ISBN: 9780806937090
List Price: $6.95