The Jumbo Book of Killer Sudoku — Intermediate to Hard - Puzzle Genius
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Penny Press PuzzleNation.com Blog
After popular demand I have added a Weekly challenge to the Guriddo puzzle app. If you are a fan of extremely difficult number puzzles, I urge you do give it a try : r/puzzles
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The Jumbo Book of Killer Sudoku - Puzzle Genius
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Genius Book Publishing – Genius Books
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por adulto (o preço varia de acordo com o tamanho do grupo)
