Will Shortz Presents the Monster Book of Kenken: 300 Easy to Hard Logic Puzzles That Make You SmarterPaperback, 9 November 2010

This monster edition of KenKen contains 300 3x3 to 9x9 size puzzles with "How to Solve" instructions and an introduction by puzzlemaster Will Shortz. The puzzles use all four mathematical operations and increase in difficulty.

Features:

• 300 easy-to-hard sudoku
• Edited by legendary New York Times crossword editor Will Shortz
• Big grids with lots of space for easy solving