Please, report any problem at developer website No-ta-da helps you to learn musical notation. It shows a random note and user should name it by hitting the corresponding key. Thank you
An educational game to learn the location of notes on the fretboard of the guitar and other stringed instruments. Eleven instruments are available, including bass (4/5/6 strings), mandolin, ukulele and banjo. Each of the instruments can be fully unlocked via in-app purchase.