Created in Japan by Tetsuya Miyamoto, KenKen has quickly become the successor to sudoku that the world's been waiting for. Like sudoku, KenKen has simple rules and is maddeningly addictive. The puzzles are based on logic and simple arithmetic and are fun for solvers of all ages. Features: 100 easy to hard KenKen puzzles using addition, subtraction, multiplication and division Puzzle grids range in size from warm-up 3x3s to challenging 9x9s Introduction and ""How to Solve"" instructions from legendary New York Times crossword editor Will Shortz Big grids with lots of space for easy solving | Will Shortz Presents Crazy for KenKen Easy to Hard by Tetsuya Miyamoto, Paperback | Indigo Chapters