This book is for Sudoku enthusiasts who like a challenge and a departure from the traditional Sudoku puzzle. These three variations either merge grids or add restrictions on how the puzzles are to be solved. In addition, they have a high level of difficulty to make them even more challenging. There are 50 puzzles (with solutions) of each type. Hyper Sudoku and Sudoku-X are 2 puzzles per page while the Twin Sudoku puzzles are 4 to a page (solutions...
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