Mensa's Most Difficult Logic Problems: Test your powers of reasoning with exacting enigmas
by Moore, Dr. Gareth Dr. Gareth Moore, Mensa Ltd,
ISBN 13: 9781787394285
Format: paperback Publisher: Welbeck
Save for later
Mensa's Most Difficult Geometric Puzzles: Tricky puzzles to challenge every angle
by Jones, Graham Graham Jones, Mensa Ltd,
ISBN 13: 9781787394278
Mensa Killer Sudoku: More than 200 of the most difficult number puzzles
ISBN 13: 9781802791846