Everyone, maps 81-90 will take place in BTS-themed test chambers and involve high tech elements, and maps 91-100 will take place in multiple time periods, such as clashes between multiple.

@Drouxaar,

Should there really be a collection based on this one taking place in the same universe and is mainly filled with Co-op Test Chambers?

Hello everyone! When Part 72 comes out, the 73rd map will be a special and large map involving Pnuematic Diversity Vents.

Chariots chariots. If any of these test chambers reach 5 stars, let me know.

i really liked the maps, they are well built, super interesting and fun. well done

map*

If you play the extra math Change Flight Directions, be careful, because there's turrets in it.

i am gonna play these

Did you know that this test chamber series takes place 30 years after Portal 2?

Any of you who are masters at using Portal 2 Authoring Tools could make the Redux edition with more test chambers, no extra maps (The bonus maps after the final level), some test chambers in the same part, and surprising twists.