4 worlds

Again, here are 3 hints to help you, they apply to each puzzle.

Spoiler: Hint 1

Every level needs help from an adjacent puzzle and helps an adjacent puzzle

Spoiler: Hint 2

There is a hidden object in every level so pay attention to dark spots

Spoiler: Hint 3

If you can't find the trigger/switch for somthing skip that level and come back when you find more switches in an adjacent level. You might find the trigger!

Here are 4 level specific hints:

Spoiler: Mountain level

That roof might be useful...

Spoiler: Water level

The goal is hidden in the corner and R is hiding under the balcony.

Spoiler: Brick level

You must sacrifice yourself in this level.

Spoiler: Stone level

There is a lift hidden under the horizontal slider that takes you to the goal.

Nice idea although in my opinion it would be better a single win and cross each room solving each puzzle to the end.
I think my favourite was the bricks room. Thanks!

Really clever ideas here, but I agree w/ @chemi that connecting each section together to a single win would be epic.

I'm giving this one five stars. I do like the idea of connecting the rooms together in a single level, although it would be hard to keep the level from becoming quite long. Nice set of compact puzzles here!

I like it!! 4 worlds = 4 zones of fun!!! Original multi-solution level Thanks for sharing and well done @Kaycal