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A Sudoku is a puzzle consisting of a grid to be filled with symbols, such that each constraining unit contains each symbol exactly once. The typical example is a 9x9 square to be filled with the numbers 1 to 9, where the constraining units are rows, columns, and 3x3 blocks.

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Removing numbers from a full sudoku puzzle to create one with a unique solution

Here's how to remove numbers from a full Sudoku puzzle to create one with a single unique solution: Remove a number, Run a solver, Check if the puzzle is still unique, Repeat until solver is unable …
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