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 100 Deadly Killer puzzles before steeling
yourself to take on the 100 Extra Deadly Su Dokus. Are you ready
for the challenge? Not for the faint-hearted. The puzzles use the
same 9x9 grid as a regular Su Doku, but have an extra mathematical
element that multiplies the 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!
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