as a Rhythm Game Enjoyer I always gotta recommend Cytus. There are paid songs but the base game has over 100, each with at least three difficulties :3
tho even if you like rhythm games I definitely recommend looking up the game first because I have yet to ever properly convince my other rhythm game-loving friends to genuinely play cytus. Still it is one of my all time favorite games
I did what I could. But there’s more I have to do.