Web Sudoku

Here's a web version of Sudoku. To play, just place your cursor in any of the squares and type the number you think belongs in that space:

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.

Be careful! It's very addictive...

P.S. -- If you like Sudoku, you'll probably also like Kakuro.