App to Memorize the Fretboard

I developed a free Android app to help memorize the notes on the fretboard called "Fretboard Learn".   The app has a bunch of game modes which let the user practice matching the name of note to a position on the fretboard (identifying the highlighted note, finding note X on string Y, and finding all X notes on the neck).   It's helped me a lot using it while I worked on it.

Let me know what you think (are there any features or options I should add?).  Thanks.

https://play.google.com/store/apps/deta … &hl=en