KenKen is a grid-sized logic number puzzle that helps students improve their calculation skills, logical thinking, problem solving and persistence. The goal is to fill a grid with numbers so that no number appears more than once in any row or column. In addition, the numbers must combine to form a target number using a specific operation. Every week, KenKen Puzzle Company will email educators a set of free KenKen puzzles that is perfect for student use. As the challenge level subtly shifts week to week, students develop their math and logical thinking skills without even knowing it. And it is all absolutely FREE, and any educators can sign up from www.kenkenpuzzle.com/teachers.