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Well, the rule of sudoku is that every 3x3 square can only contain numbers 1-9. Each row across the whole 9x9 and column can only house numbers 1-9.
So if you have a 1 on the top left corner you can't have that same number across and down. It's hard to explain cause I just do it... lol. It's mostly a process of elimination and what fits. Usually if I have 3-4 empty boxes left I can figure out a whole 3x3, column or row... .__. Bleh.
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