Variations of sudoku puzzles.

A Sudoku puzzle with 26 givens.

6 Different Types of Sudoku Puzzles You Should Try

6 Different Types of Sudoku Puzzles You Should Try - HobbyLark

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

Types of Sudoku puzzles

Mathematician claims breakthrough in Sudoku puzzle

Difference Sudoku Puzzle (Daily Sudoku League #212)

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

Types of Sudoku puzzles