For those who like to live dangerously and push beyond their mental comfort zone, steel yourself for the second Book in The Times\' toughest Killer series yet.
The puzzles use the same 9x9 g.
The Times Ultimate Killer Su Doku 2 is not for the fainthearted.
Prepare for the extreme mental challenge of 100 Deadly-level Killer puzzles, including, exclusive to The Times, 20 Extra Deadly, to really test your limits: this is the only series in which you\'ll find such a torturous collection.
For those who like to live dangerously and push beyond their mental comfort zone, steel yourself for the second Book in The Times\' toughest Killer series yet