Description
The Times Prepare yourself for the toughest Su Doku challenge there is.
These diabolically difficult puzzles will put your brainpower to the test as you warm up
with the 100 Deadly Killer puzzles before steeling yourself to take on the 20 Extra Deadly Su Dokus.
The puzzles use the same 9×9 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.
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