How do you guys manage with this?

Any recommendations? Looking for something what I can play on my phone (iphone)

Ideally free or demo/trial at least

I attempted to create a “rhythm controller” for my daughter - it’s definitely a new genre for me, but she enjoys a lot of these games. I plan on doing a V2 of this controller once she gives me some feedback on what needs to change. Here’s a quick post I made about it on the Polycade Reddit, but does anyone have suggestions on how to make a controller that is universal for many of the rhythm / music based games available on Steam - or is this a pretty standard / good layout to start with?

https://www.reddit.com/r/Polycade/s/pQJLxoSiW7

Ex: Dance Dance Revolution

If a group were brand new to rhythm games and the first game they wanted to seriously learn was ddr, how would YOU teach them note speed?