For those who like to live dangerously and push beyond their mental comfort zone, steel yourself for The Times' toughest Ultimate Killer puzzles. A bumper collection of more than 360 puzzles for hardcore Ultimate Killer Su Doku solvers. Selected from the pages of The Times these puzzles will challenge the sharpest minds. Includes Deadly-level Killer puzzles, and Extra Deadly, to really test your limits: thjs is the only placevyou'll find such...
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