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A puzzle invented by an American but popularized by the Japanese. The puzzle consists of a 9x9 grid which is partitioned into nine 3x3 boxes. Typically, 20 to 25 of the 81 cells are [pre]-filled with [one] numerical digit. The objective is to fill the remaining cells such that each digit (1 through 9) is represented in every row, column and [box]. Easy to [moderate] puzzles can be solved via simple elimination. More difficult puzzles require some "what if" propositions to solve. Solving Sudoku by [hand] is a routine diversion but writing a program to solve or create Sudoku puzzles is a more interesting challenge.
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