Sudoku - 200 Medium to Master Puzzles 9x9 (Volume 26)
Sudoku 200 Very Easy to Master Puzzles 9x9 (Volume 25)
Sudoku - 200 Easy to Master Puzzles 6x6 and 16x16 (Volume 24)
Sudoku - 200 Hard Puzzles 9x9 (Volume 23)
Sudoku - 200 Medium to Master Puzzles 9x9 (Volume 22)
Sudoku - 200 Very Easy to Master Puzzles 9x9 (Volume 21)
Sudoku - 200 Easy to Master Puzzles 6x6 and 16x16 (Volume 20)
Sudoku - 200 Hard Puzzles 9x9 (Volume 19)