This is a simple fretboard training application, meant to help you exercise sight-reading on the guitar. It shows you a randomly selected note, drawn on a staff in musical notation, which you need to pick on drawn fretboard. No attempt has been made to turn it into a game in any way, such as by counting correct or wrong answer or timing your responses, as that would have been of doubtful utility.
The program is made up of a simple HTML file, so you can either run it locally or use it straight from the GitHub page.