I'm sure the answer to be patient, but the early stages of the rhythm games especially are just really really tedious.

In your Account Settings you can turn the play speed up to fast to move things along.

The initial test is just informative (and kind of a 'hook'), as everyone starts at the same point: Level 1 at every game. If you paid for Pro membership, you can play games as many times as you like, so I'd recommend spending an extra time passing levels until you begin to struggle. If you're on the free version, your own answer is accurate enough...

Welcome and good luck!

I disabled notationist for the reasons you mentioned. Maybe it gets into reading intervals and more complicated things later, but it's hard to tell. The weekly site reading challenge often has timed interval/chord reading which is more interesting.

That's what I did -- disabled the games that would not teach me anything.

if exercises are easy for you, my suggestion is to just get through them. if you can't get through them fast enough, that means they probably present some level of challenge... difficulty increases fast and somewhat unpredictably

that said, some games might be completely useless to you (i'm looking at you, calibrator!)

Go to the Gym section and you can play each game repeatedly until you start to get to a level that tests you. It is tedious initially but worth it in the end.

What level of notationist moves beyond single notes on the treble clef? Because I did try grinding through the early levels, but at level 23 I gave up on it ever changing.

After grinding some more, I guess notationist goes to intervals at level 32.

Notationist isn't one I play that regularly, but yeah, I'm on intervals now up to an octave. Something like level 60, I think...

How far you go in depends on what really interests you. I've gone up to Level 180 on Route VI because chord progressions are more what I want to learn about than treble-clef notation, for example. And I think I'm only on Level 10 or something for Melody Jay because I find that less inspiring than a singing equivalent such as Solfegiator.

Do them fast and do them a lot. Go into a game and play it over and over. Don't play just the games in your daily workout. After finishing your workout, go back into the Gym, pick a game and play it a bunch of times. You'll shoot up faster this way.