Damn I only found 24, can't see any places I haven't been yet. I haven't figured out how to get through the grey panels that LOOK like they should be breakable

I found 28 legitimately, had to download a map editor for the last two. One of the remaining ones should've been more obvious to me than it was, and the other I have no clue how I was meant to find it.

I've gotten 29.... i see people saying 30 here but i really can't find the 30th at all. I got the purple question one earlier on, 29th one i picked up was the falling platform one. I feel like i might be missing something very obvious.