Sudoku Players' Forum (clone)

Hi!

Im a bit new of solving these puzzles. What does "pairs" and "triplets" mean? Anyone got a link to a site with good techniqs for hard puzzles. What is the big difference appearing to the solving technique between easy and very hard puzzles... ?? I need every tip i can get.

This will get you started.
http://www.simes.clara.co.uk/programs/sudokutechniques.htm