Secrets [Spoilers]

Spoiler: After Exiting (click to show/hide)

Try to get under the thing.

Found the last item
if you haven't,

Spoiler: (click to show/hide)

you haven't combed the infinite darkness well enough

Spoiler: (click to show/hide)

Room with character autoswitch. Yay! :P2

Can't find it.

Can't find it.

Spoiler: (click to show/hide)

33,29, bounce up from the pillar beneath

Yes, I do like being straightforward and non-vague.

Do you mean ball to Mi, or Mi to other playable characters?

Spoiler: The button triggers... (click to show/hide)

... an earthquake which opens a door above the cave. If you enter the cave from that area, the other secret area is accessible. Or maybe the secret is accessible after the earthquake too.

Spoiler: Regarding the distant room that previously perplexed me (click to show/hide)

I still feel certain that the rectangle room below the magma below the hidden village must have some purpose, not just be a dead end, but I can 't guess how to go about finding it. Mostly I want to know whether there's anything more to find there, because I'm at my wit's end in that particular area.

Also, in other topic, someone mentions "Tiny Figure" implying this would be third Figure secret?
I have no idea where to look for that. Or is it just in PS version?