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Pages: 110, Paperback, Independently published
Independently Published
SO YOU THINK YOU'RE SMART?: SUDOKU LEVEL HARD 50 DIFFICULT PUZZLES WITH...
Sudoku Hard: Challenging Hard 100+ Expert Level Puzzles for Serious Solvers (6x9)
Extreme Sudoku Impossibly Difficult Puzzles for Advanced & Expert Solvers
Very Hard Sudoku Only: 250 Elite Level Classic Puzzles for Expert Solvers
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