I've already determined that only 3 or 7 can fill this spot. I've highlighted in yellow the lines that already contain 7. Now one of the green boxes must be 7 which eliminates the possibility of 7 in the original square. So... I know it's 3!
Tuesday, October 13, 2009
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Yeah, it's 3, but why did you ask for an answer if you give the answer!
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