This is my favorite sudoku to work, it's called Gatti 5 and you can get it online and print out. They put 5 sudoku puzzles together, I know what you are thinking but it actually gives you more clues. Sudoku is about logic not math, the same puzzle could be worked with color, symbols or letters. Anyway... I like working them!
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My website: http://claudiahammer.com
My email: iclaudiahammer@twc.com
My DPW gallery: http://www.dailypaintworks.com/Artists/chammer-209