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Difficult would be one requiring an X-Wing, a Swordfish, or multi-coloring to solve. At least through a hidden quad in to call it difficult.... <sigh>
Jester
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I got it in 11 minutes. But if you would be kind enough to explain all these sudoku terms that you are talking about, I might just get faster and beat my wife. Right now, she is cleaning my clock on these things.
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For a rundown of Sudoku techniques, check out:
http://www.simes.clara.co.uk/program...techniques.htm
http://www.stolaf.edu/people/hansonr/sudoku/explain.htm
For ridiculously hard puzzles involving all these techniques, see:
http://www.sudocue.net/daily.php
To make your head explode, go here:
http://www.sudoku.org.uk/PDF/Dion_Cube.pdf
Jester