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KenKen has quickly become the successor to sudoku that the world's been waiting for! is a puzzle whose solution requires a combination of logic, simple arithmetic, and combinatorial skills. This Book of KenKen contains 300 easy to hard 3x3 and 4x4 and 5x5 and 6x6 size puzzles, with solutions. The puzzles use all four mathematical operations and increase in difficulty. Perfect for part-time players and experienced puzzlers alike who want to challenge themselves without pulling their hair out. Grab a pencil, pour yourself a cup of coffee or tea, and enjoy.