This is an idea that I had recently. There will be a long line of these things, which you need to activate one by one.

Then you need to slide underneath.

Hopefully you activated them into a good patten for this.

I found it by accident... A (maybe a)bug about "nogeomcollisions".It's very easy.

My first addin since April 9, 2013 with Underwater Level Demonstration was released. This is a demo of my released addin, World of Goo: Bubble Quest (was released on May 27, 2014).

inwog's 2nd sample addin
Addin made by inwog

This is basically slightly modified version of going up...with a simple catch. You'll see what I mean.

::MINOR SPOILERS::
This kind of explains the level, so if you don't really want to know what the catch is, then don't read ahead. Okay? Cool.

I put this as a sample level, as its a way to use thin geometry as an gimmick to the level. In this case, there's a thin gap between the ground and the ballbuster part. This is why when you drop an egg from a certain height, it'll "crack". That's really it.