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building TESTCollection by ^9|3lack ^1|3lood Ͼ_Ͽ
Cube sportsCollection by TalonOut
Welcome to the C.O.G.(Cube Olympic Game)...Faster, higher, cuber!
Shawnathan's TestsCollection by Shawnathan55
These are chambers i have made myself, (with usage of ideas from cousins and others). They're probably not hard, but some have cool machines to use.
DeathrunCollection by Critticalt
The Deathrun Chambers which isnt that challenging, but Deadly
The Mad Panda Test ChambersCollection by RevDogma
A collection of custom test chambers that fit no particular catagory. NOTE: These were all crafted in the puzzle creater ALSO: There will be an unknown number of additions to this collection.
N1k145's TestkammernCollection by N1k145
Eine Sammlung von Testkammern von N1k145
-C-A-K-E-Collection by The Cake Nazi
Collect 4 pieces of CAKE in 4 different test chambers. Each chamber presents a different challange with different testing elements. Good luck, and remember, the CAKE wasn't a lie! :]
BoneZ's LevelsCollection by BoneZ
All of my levels.
Yeah Toast !Collection by Pʀoρʜϵτ
An experience in 4 parts, and, I have to advert you, quite hard. Submit if you think you can resolve it ! Good luck... And have fun ! P.S: find the great observation chamber in part 3. Not so easy !
Trick Brick's CollectionCollection by Marco-Polo
Just my general Test Chambers for you to enjoy!
Fragsoc VertigoCollection by -=JT=-
Rishal's Test Chambers Part 1Collection by Pop Music Sucks!
Portal 2 Test Chambers by user rishalsinghbajaj.
MeusCollection by Carraca
Test it for scienceCollection by EccleStone
Different features - have fun ! Thank you for participating and volunteering. Feedback and bug reporting is greatly appreciated.
Cooperative Building InitiativeCollection by Deli
This is a set of levels me and my friend Ian have worked on together. Note that "cooperative buliding initiative" refers to the fact that we are MAKING the tests together, not all of these tests are cooperative levels.
Easy test chamber.Collection by artyomovg
RetaRoomCollection by [G-Zu] Retalyx
Toues les cartes RetaRoom
For Lack of A Better Name: The Negative ChambersCollection by ҐⱪɑƦσS
The For Lack of A Better Name Negative Collective which Holds the Pre-Hammer playable maps
Dead MeatCollection by The Companion Cube
The 10 Chamber Series 'Dead Meat'
Testsubject OtzeCollection by [GER] DeaxterHawk
Hier befinden sich die Testchamber für mein Testsubjekt Otze! Otze's "Let's Play your Level": (Playlistlink Folgt)
StuffCollection by Mr. Dr. Prof. Sir Joseph
2GstuffCollection by Stuart Pot (2D)
IS NICE JES?
Test Chamber Collection - 3 Steps to Portal (by Epicmagination)Collection by Rubens Benevides
So testing subject, you've defeated glados TWICE, you went to space and surived, BUT NOW WE GOT BRAND NEW TESTING CHAMBERS Begin Testing I hope you guys like it, check out my channel for more - http://www.youtube.com/user/epicmagination
some chambers!!Collection by rodas136
Trials of MadCollection by Fappy-san
A series of maps made by » M@Ð$k!llz «
Aperture: Quartz Mare SciencesCollection by Ivory Rose
In this Universe, Aperture Science is run by a Pony named Reese Johnson who, before she founded Aperture to provide Celestia's Royal guard with shower curtains, made a fortune buying and selling Quartz crystals to superstitious ponies who believed it woul...
I wanna see y cryCollection by InsaneFührer
Tales Of The Fallen: Portal VenturesCollection by FearCrossing
My Map Pack, Also with my Weekly Chambers!
Path of BallsCollection by mrCookieSlime [GER]
At the Beginning was it easy,but you must survive in the other Chapters of "Path of Balls" It´s a collection with the maps of "Path of Balls".It called so,because in each Chapter is a Ball. my Steam-Group: TerracraftLP
The Dolphin Initiative TestingCollection by The Dolphin Whisperer 
Tests created by dolphins, for testing by humans. Mehekek, ekekekekeke, ehek, ekeke EHEKEKE ehe ehek ek ek ekekek... mehekekek MEHEKEKEK!