I've found a floor clip by using 1 of the empty block holes used to enter World 2. It's extremely simple and easy to do, just walk against the bottom left corner of the hole until you clip.

I'm assuming depending on how far you hold forward after you clip, you will either go into the floor and be able to move around, or get stuck in the hole and softlock.

Interested to see if this leads to anything...

It'll be pretty neat if you could enter World 4 early due to this

I tried it out, but I wasn't able to go on a different place.

If there is it would cut the run in half. Even if it's unlikely we should keep looking.

I haven't had any luck either