Sudoku: Over 200 Puzzles & Solutions, Easy to Hard Puzzles for Adults, Spiral-Bound (Brain Busters) Parragon Books
Big Book of Sudoku: Over 500 Puzzles & Solutions, Easy to Hard Puzzles for Adults (Brain Busters) Parragon Books
The Ultimate Book of Mixed Puzzles: More than 450 Puzzles for Adults Including Word Searches, Crosswords, Sudoku, Mazes and More! (Part of the Brain Busters Puzzle Collection) Parragon Books