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Edition: 1, Paperback, CreateSpace Independent Publishing Platform
CREATESPACE
200 Very Hard Sudoku Puzzles Volume 1: For Advanced Players
Independently Published
Ultimate Sudoku Book: Hard Puzzles for Advanced Players
The Little Sudoku Book: Hard: 55 Hard Puzzles for advanced players.
Sudoku Hard For Advanced Adult Players 365+ Challenging Puzzles Serious Puzzle Fans
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