8 books • 2 series
Sudoku Level 1 9x9 (Little Big Puzzle Book)
Sudoku Level 4 9x9 (Little Big Book of Puzzles)
Sudoku Level 3 16x16 (Little Big Book of Puzzles)
Sudoku Level 4 16x16 (Little Big Puzzle Book)
Sudoku Level 1 16x16 (Little Big Puzzle Book)
Sudoku Level 2 9x9 (Little Big Puzzle Book)
Sudoku Level 3 9x9 (Little Big Puzzle Book)
Sudoku Level 2 16x16 (Little Big Puzzle Book)