## Sudoku-x Puzzle Books 16 x 16 Numbers & Letters – 100 Extreme Puzzles

Welcome to the Sudoku-x 16 x 16 Puzzle Books Series. Even though the puzzles in the “Extreme” version are very difficult to complete, each one can be solved with logic and advanced solving techniques, unlike some extreme puzzles that require you to guess and then work back if the solution turns out to be …

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