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Pages: 136, Paperback, Independently published
Independently Published
Sudoku Black Book Volume 1: 180 Extreme Puzzles for Experienced Solvers No...
Sudoku Black Book Volume 2: 185 Extreme Puzzles for Experienced Solvers No...
Sudoku Black Book: Extreme Edition: 150 Ultra-Difficult Puzzles For Experienced Solvers No...
Burst Verse Books
Killer Burst Sudoku — Extreme (Volume 1): No Guessing Required · 200 Logic-Certified Puzzles
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