KenKen is a logic-based puzzle that combines elements of arithmetic and Sudoku. It consists of a grid, typically ranging from 3x3 to 9x9, divided into heavily outlined "cages." Each cage has a target number and a mathematical operation, such as addition, subtraction, multiplication, or division, that must be used to fill in the numbers. Players must fill the grid with digits so that each row and column contains unique numbers, similar to Sudoku. The challenge lies in adhering to the mathematical rules of each cage while ensuring that no numbers repeat in any row or column.