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Here we look at 10/10 difficulty puzzle. Simon explains how to solve this deadlyrated puzzle from 3 february. Here are some of the techniques you need to tackle toughest this sort sudoku.
And it doesn't disappoint. Simon solves the deadly killer sudoku from times on 9 sept 2017. Simon starts a new series of videos which will highlight quick tips that improve your killer sudoku technique.
Several advanced techniques are needed and explained in this complete guided solve. Simon takes a look at very difficult killer sudoku (rated deadly by the times on 6 april 18).