KenKen KenKen is an arithmetic and logic puzzle that can improve our calculation skills, logical thinking, and persistence. The rule of this puzzle is very simple. It consists of an equal number of rows and columns. The player can input any digit in every square. The lowest input is a 1 and the highest input is equal to the number of rows or columns. The input must not repeat in the same row and same column. The puzzle consists of a heavy-outlined area called \"cages". The top left corner of each cage has a "target number" and a mathematical operation. The numbers or inputs in each cage must combine to produce the target number using the mathematical operation {+= ,>