My music theory teacher has built from scratch, without much coding knowledge, an Electron app with games. Example of games are: guess the 2-3 notes randomly played by the piano, find the intervals etc. Those are multiple choice games mostly.

He is now on a journey to build games that interact with notes on scores, like colorize all the Cs, click on the notes that are wrong vs what you hear etc.

He is building everything from scratch, with the scores, the notes, and I'm wondering if there are some tools or libraries out there that provide much flexibility to build stuff for music theory.