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- Jigsaw Sudoku 400+ Hard Puzzles Volume 1: Bored of regular Sudoku? Try your hand at Jigsaw Sudoku
- Jigsaw Sudoku 400+ Hard Puzzles Volume 5: Bored of regular Sudoku? Try your hand at Jigsaw Sudoku
- Variety Sudoku Puzzle Book 400+ Medium Puzzles Volume 1: 400+ Medium Sudoku Puzzles for Adults (400+ Medium Assorted Sudoku Puzzles)
- Variety Sudoku Puzzle Book 400+ Medium Puzzles Volume 2: 400+ Medium Sudoku Puzzles for Adults (400+ Medium Assorted Sudoku Puzzles)