Most helpful critical review
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Times Killer Sudoku. Just too easy
on 1 April 2013
None of these Times Ultimate Killer Sudoku books are difficult.
These books say things like "the deadliest of killer Sudoku" and the "the toughest there is" etc.
These comments are just not true.
If you real want a very good challenge buy Stefan Heine "Hardcore"
Stefan Heine also does books with a range of difficulties available on Amazon.
I am no relation and have no financial interest.