Publisher's Synopsis
Hard-as-Nails Sudoku 5 contains over 200 puzzles that are guaranteed to rack the brains of even the most practised Sudoku addict - perfect for anyone who finds that most Sudoku puzzles just don't test them any more. The pocket-sized format means that you can test and build you logic and reasoning skills, improve your memory and keep your brain healthy on your daily commute, at the airport, on holiday or in the comfort of your own home.
