Free Sudoku!

I was searching around the web and found a site that offers billions of Sudoku puzzles available for free online. I hadn't fallen victim to the Sudoku craze, but I worked my very first Sudoku puzzle - it took a while to finish it, but it's pretty cool. I can see why so many have been consumed by these puzzles - it's very addictive...

Each Sudoku has a unique solution that can be reached logically without guessing. 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.