400 Einfach-Schwerer Sudoku #4 - Prijzen

The Active Brain- 500 Hard Sudoku Puzzles

Active Brain Series bumper book of 500 hard Sudoku puzzles with solutions. Sudoku is a fun way to exercise your brain and there are plenty of puzzles in this book to give it a really good workout The...

The Ultimate in Sudoku Techniques! the Challenger's Preferred Sudoku Book

Brain Gym- Sudoku

Put your brain through it's paces with this Brain Gym book of 1000 Medium difficulty Sudoku puzzles, perfect for taking your Sudoku to the next level. We exercise our bodies but our brains need a work...

Geisha- Sudoku 1000 Very Hard Puzzles

Addicted to Sudoku? With 1,000 puzzles in this Geisha Series book by Katsumi this is the perfect book for some serious sudoku solving. Book 4 in this series contains all very hard puzzles for advanced...