7x7 Futoshiki Puzzle: The Best Logic Puzzles Collection (Futoshiki Large Print, Band 1) - Softcover

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Futoshiki (from Japanese, literally "not equal"; also known as "Hutoshiki", "Unequal") is a logic puzzle.
The puzzle is played on a square grid, such as 9 x 9. The objective is to place the numbers 1 to 9 (or whatever the dimensions are) in each row, ensuring that each column also only contains the digits 1 to 9. Some digits may be given at the start.
In addition, inequality constraints are also initially specified between some of the squares, such that one must be higher or lower than its neighbor. These constraints must be honored as the grid is filled out.

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