hooked on sudoku

my aunt inrtoduced me to this puzzle which i'm completely hooked on.

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www.websudoku.com
The rules of Sudoku are simple. Enter digits from 1 to 9 into the blank spaces. Every row must contain one of each digit. So must every column, as must every 3x3 square.
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if you have time, try it. i've been playing all day, since i got plenty of time, haha.