can stop, will stop
Thanks, that was a really hard spot for me too! The thing that got me past it was doing a low bounce off it. Not sure if that's actually a spoiler since you probably already know that, but just in case.
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This took me to a new room with an actual switch. I hit it, and green blocks flew out into the world, but the palace didn't flatten down on the world map the way they usually do. So I can't tell if I'm missing something, or if it's just a weird graphical artifact caused by the existence of a second exit.
I might try a few more times by myself, but I'll admit that I'm a bit less into the "solving a mystery" aspect of kaizo and there are times when I just want to know how to proceed.
I had a bit of trouble in Rainbow Road because of the weird physics you get jumping off the invisible Yoshi - maybe that's something that was covered in the later levels of Learn 2 Kaizo?