Killer Sudoku - 200 Hard Puzzles 9x9 (Volume 4) (Hard, #4)
by Oliver Quincy
Sudoku 15x15 - Fácil ao Extremo - Volume 22 - 276 Jogos (Sudoku, #22)
by Nick Snels
Sudoku Girandola - De Fácil a Experto - Volumen 1 - 276 Puzzles (Sudoku Girandola, #1)
by Nick Snels
Criminal Minds Sudoku and Crossword Activity Puzzle Book
by Mega Media Depot
Creator of puzzles - Straights 240 Easy Puzzles 7x7 (Volume 1) (Creator of Puzzles - Straights, #1)
by Mykola Krylov and Veronika Localy
Random Easy To Very Hard Sudoku Puzzles (Random Easy to Very Hard Sudoku Puzzles, #1)
by Kellie Rose