Challenge yourself with 200 tricky Su Doku puzzles. A collection of 200 puzzles which are perfect for the Su Doku solver who is looking for one step up from the very basic Su Doku puzzles. If you are in need of a supply of more challenging puzzles, these are guaranteed to provide hours of absorbing, brain-stretching entertainment.
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‘The Times Difficult Su Doku Book 1 - Times Mind Games’.
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