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Prepare yourself for the toughest Su Doku challenge there is. These diabolically difficult Ultimate Killer Su Dokus will really put your brainpower to the test as you warm up with the 120 Deadly Killer puzzles before steeling yourself to take on the 20 Extra Deadly Su Dokus. Are you ready for the challenge? THE TIMES ULTIMATE KILLER SU DOKU BOOK 5 is not for the faint-hearted. The puzzles use the same 9x9 grid as a regular Su Doku, but have an extra mathematical element that makes them a real challenge. The aim is not only to complete every row, column and cube so that it contains the digits 1 to 9, but also to make sure that the outlined sections, called cages, add up to the number given in each cage. Warning: Not suitable for amateur puzzlers. If you survived the first four collections of Ultimate Killer Su Doku, then you might be ready to take on the fifth.
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Prepare yourself for the toughest Su Doku challenge there is. These diabolically difficult Ultimate Killer Su Dokus will really put your brainpower to the test
Perfect for coffee breaks, commutes or relaxing at home, this bumper collection of 300 brand new ultimate killer sudoku puzzles is guaranteed to provide you wit
The ideal gift for su doku enthusiasts. If you like to live dangerously and push beyond your mental comfort zone, steel yourself for The Times' toughest Ultimat