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## Free KenKen Online

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KenKen is a mathematical and logical puzzle game. It is a grid-based puzzle that combines elements of Sudoku and arithmetic operations. The goal of the game is to fill a grid with digits according to specific rules.

Fill in the grid with numbers from 1 to the grid size, so that every number appears exactly once in each row and column (like in Sudoku), and so that all the arithmetic clues are satisfied. (i.e. the clue number in each region should be possible to construct from the numbers in the region using the specified arithmetic operation. Unlike in Sudoku, numbers may be repeated within a region.)

To place a number, click in a square to select it, then type the number on the keyboard. To erase a number, click to select a square and then press Backspace.

Right-click in a square and then type a number to add or remove the number as a pencil mark, indicating numbers that you think might go in that square. Click on the puzzle and press the M key to fill every square with a full set of pencil marks.

Courtesy of Simon Tatham's Puzzle Collection via the MIT license.

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