Musical Sudoku - Resounz

This is a musical version of the classic Sudoku game!
(Thanks to Konstantinos Hatzopoulos of w-sudoku.com for allowing us to adapt his game.)

Objective

Fill in the grid so that every row, every column, and every 2x3 box contains a

How To Play

To begin playing, select a level of difficulty or click on the "New Game" button.
Drag one of the notes at the top of the game into what you think is the correct square in the game grid. (You do not have to be exact with your placement as the game centres the note for you automatically.)
Continue placing notes until you have filled the game grid.
If you fill the grid correctly you will be presented with the time taken and a congratulatory message.
If you have not placed all notes correctly on the grid, the time will continue counting up.
The shortest time is recorded; to be displayed next time you play.