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Herrera, Aldo A.

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Stand Alone

Easy Sudoku puzzles book Vol.3: 300 puzzles for adults, special grids size
Easy Sudoku puzzles book Vol.2: 300 puzzles for adults, special grids size
Easy and Medium Sudoku: 1000+ puzzles book for adult
Hard Sudoku: 1000+ puzzles book for adult
Hard Sudoku puzzles book: 300 puzzles for adult, special grids size