Extrem hartes Sudoku: 300 sehr schwierige Sudoku Rätsel mit Lösungen: Volu...
Extremely Hard Sudoku: 300 Very Difficult Sudoku Puzzles with Solutions: Volume 21 by Bean, Rebecca, ISBN 1540670899, ISBN-13 9781540670892, Brand New, Free shipping in the US This extremely hard Sudoku workbook has 300 very difficult puzzles with solutions. This is Volume 21 of a series created to offer more challenging Sudoku puzzles. Each volume is completely independent from the others and has 300 new and different puzzles. In other words, you can start with any volume in the series. They do not need to be worked in any particular order. What each volume does have in common is having 300 very hard Sudoku puzzles, similarly styled in a 9 by 9 game. Each puzzle also has a solution key. You'll want to try not to peek, but if you get stuck, it's there to help!
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