400 classic sudoku 9 x 9 VERY HARD LEVELS + BONUS 250 Labyrinth puzzles: Sudoku with VERY HARD level puzzles and a Labyrinth 21 x 21 very hard levels: Holmes, Basford: 9781727228700: Amazon.com: Books
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400 classic sudoku 9 x 9 HARD - VERY HARD LEVELS + BONUS 250 Labyrinth puzzles: Sudoku with Hard, Very hard levels puzzles and a Labyrinth 21 x 21 very hard levels: Holmes, Basford: 9781727241532: Amazon.com: Books
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400 classic Killer sudoku 9 x 9 EASY + BONUS 250 Hidoku puzzles: Sudoku with EASY levels puzzles and a Hidoku 9 x 9 very hard levels (Killer classic sudoku 9 x 9): Holmes, Basford: 9781727255775: Amazon.com: Books
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