Offers OMNI LOGIC
Killer Sudoku 200 Puzzles Easy to Hard Volume 1: Math Logic Sum Sudoku Puzzles for Adults (Samunamupure Kikagaku Nampure)
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Kakuro Puzzle Book Easy - Medium Volume 1: Cross Sums Puzzles for Beginners | 160 Mathematical Logic Puzzles
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Chaos Sudoku: Extrem | 200 Unregelmäßige Sudoku Puzzles der Grösse 9x9 (Jigsaw-Sudoku, Freiform-Sudoku, Irreguläre Sudoku)| Band 12
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