Also known as Calcudoku, Mathdoku, KenDoku
A style of arithmetic and logic puzzle
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How to prepare this
- Find some KenKen puzzles. You may find several online.
How to do this
- The goal of each puzzle is to fill a grid with digits 1 through 4 for a 4×4 grid, 1 through 5 for a 5×5, etc. so that no digit appears more than once in any row or column.
- Grids range in size from 3x3 to 9x9. Additionally, KenKen grids are divided into heavily outlined groups of cells (often called cages) and the numbers in the cells of each cage must produce a certain "target" number when combined using a specified mathematical operation (either addition, subtraction, multiplication or division). For example, a three-cell cage specifying addition and a target number of 6 in a 4×4 puzzle might be satisfied with the digits 1, 2, and 3.
- Digits may be repeated within a cage, as long as they are not in the same row or column. No operation is relevant for a single-cell cage: placing the "target" in the cell is the only possibility.
- The target number and operation appear in the upper left-hand corner of the cage.