A collection of test chambers that have a small story attached to them. Dunno why.
The first few maps begin easy, but they become ever so slightly harder after that. Not too hard though, I'd say medium difficulty at best.

Since you're here, you may as well subscribe to my Youtube Channel for Portal 2 walkthroughs and guides!

If you're having issues with playing the maps, like ERRORs and such:
"Found that installing BEE2 development environment and then choosing "File > Export to Portal 2" and then launching Portal 2 from the BEE2 UI solved all the problems."