Variations of sudoku puzzles.
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Beta Beginner Sudoku Puzzles: 500 Beginner Sudoku Puzzles and Answers Beta Series Volume 7: Easy to See Large Clear Print (Paperback)

Cross+A :: Sudoku

Sudoku Puzzle Types
Over 2,000 of Dell’s best Sudoku puzzles, past and present!

Sudoku Spectacular Value Pack-6

6 Different Types of Sudoku Puzzles You Should Try - HobbyLark

All puzzle types
Difference Sudoku Puzzle (Daily Sudoku League #212)

Mathematics of Sudoku - Wikipedia

Types of Sudoku puzzles
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