Programming Sudoku (Technology in Action): Lee, Wei-Meng: 9781590596623: Amazon.com: Books
Amazon.com: Sudoku - Puzzles & Games: Books
How Sudoku: Make You Smarter and Improve Your Memory (Including Solving Strategies) (Mental fitness to keep your brain sharp): Adams, Mark: 9798476321255: Amazon.com: Books
Amazon.com: Loftus Sudoku Puzzle Cube - A Fun Portable Take On The Classic Sudoku Game - Can You Solve All 6 Sides, Multicolor : Toys & Games