Jigsaw Sudoku-X Puzzle Books – 250 Very Hard Puzzles

  Welcome to the Jigsaw Sudoku-X Puzzle Books Series. The puzzles in the “Very Hard” version are ideal for experienced solvers that have knowledge of advanced solving techniques. Each puzzle has a unique solution which can be completed using logic, with no guessing required. Although this difficulty level is described as “Very Hard”, some very …

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