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Origin and History: The concept of Sudoku dates back to the 19th century, but the modern version we know today was developed in 1979 by Howard Garns, a retired architect from Indianapolis, Indiana. usa today puzzles sudokusudoku advanced solving methods Sudoku is a number-placement puzzle that requires players to fill a 9x9 grid with digits so that each column, each row, and each of the nine 3x3 subgrids that compose the grid (also called "boxes", "blocks", or "regions") contain all of the digits from 1 to 9. unique rectangle sudoku Use the "naked triple" and "naked quadruple" techniques to identify groups of three or four numbers that must be placed in the same row, column, or 3x3 subgrid. Trial and Error Although it may seem counterintuitive, trial and error can be an effective technique in Sudoku. where to buy sudoku books in store
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