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puzzles usatoday sudoku Title: Mastering the Unique Rectangle Sudoku Technique: A Comprehensive Guide Introduction Sudoku, a popular puzzle game, has been captivating puzzle enthusiasts for decades. The objective is to fill a 9x9 grid with numbers from 1 to 9, such as in the following example: +-------+-------+-------+ | 1 | 2 | 3 | | 4 | 5 | 6 | | 7 | 8 | 9 | +-------+-------+-------+ | 1 | 2 | 3 | | 4 | 5 | 6 | | 7 | 8 | 9 | +-------+-------+-------+ | 1 | 2 | 3 | | 4 | 5 | 6 | | 7 | 8 | 9 | +-------+-------+-------+ The grid is divided into nine 3x3 subgrids called "boxes." Each row, column, and box must contain all the numbers from 1 to 9 without repetition. sudoku bookssudoku rubik's cube The Appeal of Extreme Sudoku Increased Difficulty : Extreme Sudoku is designed for those who have already mastered the basic Sudoku game. Utilize the "Coloring" Technique: This technique involves coloring cells or rows based on the numbers they contain. sudoku grid patterns analysis Pigeonhole Principle: If there are only two possible numbers left in a row, column, or subgrid, one of them must go in a specific cell. sudoku books
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