JavaFX Sudoku

Click here to run JavaFX Sudoku as a standalone application via Java
WebStart.
Click here to run JavaFX Sudoku as an
applet. If your JRE (Java Runtime Environment) and broswer
support "draggable applets", you can drag your mouse on the top of the
JavaFX Sudoku window to detach the applet from the browser.
Click here for the source code.