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ku is a placement puzzle, also known as Number Place in the United States.
The aim of the puzzle is to enter a number from 1 through 9 in each cell of a grid, most frequently a 9×9 grid made up of 3×3 'regions', starting with various numbers given in some cells (the 'givens').
Each row, column and region must contain only one instance of each number.
Completing the puzzle requires patience and mod...