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I produce three puzzles daily (Ok, sometimes I miss a day here and there). They are:
Sudoku: Hard (You need fancy stuff to solve these. X Wings, Swordfish, UR's etc)
Sudoku: EXTREME (for the toughest of the tough. You have been warned)
Consecu-doku (what's that?)
If you're not familar with the advanced solving techniques, check out my tutorial here
Happy puzzling! Enjoy!
"Doc John" Musgrave