This fifth and toughest addition to the successful times killer su doku series will test your skills to the limit adding the challenge of arithmetic and taking su doku to a new and even deadlier level of difficulty. The latest volume in the hugely popular killer su doku series from the puzzle suppliers to the times featuring the highest quality puzzles with an extra element of arithmetic. Find many great new used options and get the best deals for the times killer su doku book 7 150 lethal su doku puzzles by the times mind games paperback 2011 at the best online prices at ebay. The times killer su doku book 13 200 lethal su doku puzzles times uk on amazoncom free shipping on qualifying offers the puzzles here use the same 9x9 grid as su doku but with an added mathematical challenge the aim is not only to complete every row. With 150 new tough and deadly killer su doku puzzles there is no chance to ease yourself in with easy puzzles for those who like to live dangerously and push beyond their mental comfort zone steel yourself for the times toughest collection yet
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