# Kenken

Hi campers, this is Avo. today I’m going to introduce you to an arithmetic and logic puzzle, Kenken. It was invented in 2004 by a Japanese math teacher. Other than number placement, there are also some easy calculations involved in the puzzle. It is fun and great for practice you brian. Now let’s  take a look at the rules and examples.

Puzzles from:

http://www.kenkenpuzzle.com/game

Rules:

• The Kenken puzzle is played on a grid, it can be in any size from 3×3 to 9×9.
• The grids are divided into heavily outlined groups of cells, they are called cages
• There are numbers and calculating signs in each cage, they are the targets, we need to fill in the number in each cage so that after assigned calculations, they can equal to the target number.
• For example, if the target for this cage is 3-, we need to find two numbers that equals 3 after subtracting.
• Each number can only be used once in each row and column
• The range of numbers to fill in depends on the size of the grid. For example, in a 4×4 grid, we need to fill in numbers from 1-4.