Sit Solve Easy KenKen - Sit & SolveŽ Series Author:Tetsuya Miyamoto KenKen, a grid-based numerical puzzle, is touted as "yoga for your mind" and the "puzzle that makes you smarter." It uses basic math operations?addition, subtraction, multiplication, and division?while challenging logic and problem-solving skills. When players think ahead, plan the next move, and consider all the possible outcomes, the better th... more »ey'll get at the game . . . and the more they'll sharpen their mind.