How to Solve a sudoku puzzle with special techniques

Solve sudoku puzzle using the cross hatching, either/or, and pairs technique. If you can use a magic marker, and feel competent enough, then why not try it out?

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This helped me a great deal. I've been able to advance to the hard puzzles. There have been times when I was able to get an additional 6 - 7 cells filled with just getting 1 either or number filled. Great. Now if you could just give me another trick for the hard puzzles....

awsome thanks

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