The Times Ultimate Killer Su Doku Book 10: 200 challenging puzzles from The Times

The Times Mind Games

Specially compiled to provide the most deadly Su Doku challenge, this is the only volume for Su Doku enthusiasts who need a puzzle that really tests their mettle. Prepare yourself for the toughest Su Doku challenge there is. These diabolically difficult Ultimate Killer Su Doku puzzles will really put yo...