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sudoku solver app These books often contain puzzles of increasing difficulty and can be a great resource for both beginners and advanced solvers. The objective remains the same as the classic Sudoku: fill the grid with numbers 1 to 16 such that each number appears exactly once in each row, column, and 4x4 sub-grid. sudoku free offlinelocked candidate sudoku Subgrid Analysis : Since the medium edition includes a central 3x3 grid, focus on solving this section first. XY-Wing: This technique involves identifying a chain of three cells, each containing two numbers, which form a cycle. sudoku offline game
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