511 books • 54 series
Master of Puzzles - Chain Sudoku 200 Hard to Master Puzzles 6x6 vol.2 (Chain Sudoku, #2)
Master of Puzzles - Chain Sudoku 200 Hard to Master Puzzles 7x7 vol.4 (Chain Sudoku, #4)
Master of Puzzles - Chain Sudoku 200 Easy to Medium Puzzles 6x6 vol.1 (Chain Sudoku, #1)
Master of Puzzles - Chain Sudoku 200 Easy to Medium Puzzles 8x8 vol.5 (Chain Sudoku, #5)
Master of Puzzles - Chain Sudoku 200 Easy to Medium Puzzles 7x7 vol.3 (Chain Sudoku, #3)