Second-Degree Black Belt KenKen® (Martial Arts Puzzles Series)

Math meets sudoku in this fun, challenging puzzle craze from Japan.

Calling all KenKen experts! These puzzles are meant only for the experienced solver eager to try some super-hard brainbusters. 

KenKen is a grid-based numerical puzzle that uses basic math operations—addition, subtraction, multiplication, and division—while also challenging your logic and problem-solving skills. In a way, KenKen is like a game of pool or even chess: The more you think ahead to your next move and consider all the possible outcomes, the better you’ll get . . . and the smarter you’ll become!