(line reserved for when I'm actually able to put links in the description)
Sequel difficulty spike compared to the predecessor. Involves a greater degree of precision, glitches, more intricate design, and some custom blocks and sprites.
Some details might have been changed since then, including (IIRC) an entire sublevel in the first level that I felt was a bit too hard for that point, and probably some to the last level (think I made it a choose your path type of thing IIRC). As with the previous videos, I didn't feel like playing again just to record new videos. This is the kind of hellish difficulty I don't really like actually making or testing but just watching is fine.

0:00 Title
1:26 Aneurysm
6:18 Ripley's Aquarium
12:55 Fiscal Cliff
19:00 What the Shell?
25:46 Cave Johnson
34:41 I Hate Masks 2
41:51 Flower vs. Cape
49:04 Gatekeeper
52:04 Megalomania