It already has that feature! :) It’s just not very obvious. If you click the small lock icon near the top, it will snap and to that difficulty so you can practice only sequences with that specific number of notes.
This is so well done and very cool. Thanks for building it and offering it.
As someone who hasn't had a piano lesson in about 40 years, I find myself wanting to play with the keys to match the melody. So I hear the initial melody, and then I'm practically hitting keys at random (guessing where I should be on the keyboard) until I find the first note, and then I have to listen over and over again while trying to find the second note. I kind of want to hunt and peck until I'm ready and then get tested to see if I nailed it.
Glad you like it! A couple of people have asked for this feature and I guess I've been struggling with how to fit this concept into the game.
Maybe the answer really is just as simple as a little visual toggle that puts you in a "sandbox" mode where all the sounds still go through, but the game doesn’t respond to them until you untoggle it.
As someone who hasn't had a piano lesson in about 40 years, I find myself wanting to play with the keys to match the melody. So I hear the initial melody, and then I'm practically hitting keys at random (guessing where I should be on the keyboard) until I find the first note, and then I have to listen over and over again while trying to find the second note. I kind of want to hunt and peck until I'm ready and then get tested to see if I nailed it.