The rules to Sudoku are simple: Fill in the grid so that every row, every column, and every 3x3 box within the grid contains the numbers 1-9. For example, if you're trying to figure out whether to put a "2" in the top-left corner, you'd need to make sure that there isn't already a "2" in the top row, the far-left column, or the 3x3 box in the upper-left portion of the grid. I know it sounds a little complicated, but it's really not. I've completed the first grid already. If you get stuck, you're allowed three hints.

Controls: Arrow keys and number pad... OR use your mouse, and click to select numbers.