From Sudoku! Developer

Thanks for your feed back, Barbcarreras. Playing your music in the background is something we have on our list. If there isnt any sound issues in this version, well be rolling it in the next update.

In the meanwhile, you can also play your own music in this version by selecting your playlist and then launch the game. The game music will just fade away.

Aun Taraseina about Sudoku!