Instructions

1. Enter any fixed squares first, then right-click them to make those squares un-editable (and change their color)
2. Then, to check any row/column, put your cursor in any square in that row/column or click any square in that row/column.
3. Then select the appropriate check-type and click "check"
4. Currently, the checking only does rows... no columns or squares. I'm hoping you can see how to do the rest (squares may be difficult).
5. Also, output from the checking only goes to the console... thus you will not see it in the applet through the web. It's up to you to figure out how to you want to alert the user of any errors (perhaps a label that changes color?)