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New Aperture TestingCollection by CrazyBFG
The New Apereture Tests are a series of tests that I have made that progressively get harder. These tests will range from easy to hard.
portal chambersCollection by Reikles Farmskins.com
Aperture ScienceCollection by Artanis
Some fun tests to play if you havent got anything to do.
Hammer SeriesCollection by dire.fcs
Hammer maps (original & remakes).
Portal 2Collection by The RAi†H ™
Portal 2 Co-op maps
Wheatley´s DetourCollection by Portal Turret
Onsen Test ChamberCollection by Onsen UI
my test chambers. 10 and 20 are quite difficult. glhf
The Logical Knot (Abyss)Collection by RedSilencer
My MapsCollection by RubyWolf
All my maps in one place