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!