Variations of sudoku puzzles.

All puzzle types

Printable Sudoku Puzzles

Math Games:Sudoku Variations

Mathematics of Sudoku - Wikipedia

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Glossary of Sudoku - Wikipedia

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A Sudoku puzzle with 26 givens.

To Wear the Sudoku Crown, One Must Solve Any Number of Puzzles - The New York Times

6 Different Types of Sudoku Puzzles You Should Try - HobbyLark

6 Different Types of Sudoku Puzzles You Should Try

Logic Puzzles & Brain Games for Adults: 500 Easy to Hard Puzzles & 12 Puzzle Types (Sudoku, Fillomino, Battleships, Calcudoku, Binary Puzzle, Slitherl (Paperback)

About Sudoku Puzzles

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Sudoku - Wikipedia