The Times Ultimate Killer Su Doku Book 9 : 200 Challenging Puzzles from the Times

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 your brainpower to the test as you 'warm up' with the 150 Deadly Killer puzzles before steeling yourself to take on the 50 Extra Deadly Su Dokus. Are you ready for the challenge? Not for the fai