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| title = Mod Test Chambers ...Tag: The Paint Gun Testing Initiative Chapter 1 Test Chamber 1{{if lang}}|01]]<!--

...emale voice welcomes Chell and informs her that she is a test subject. A [[Portals|Portal]] then opens{{spoiler| after a strange malfunction in the robotic vo ...based mechanic}}, she is put through more tests to further understand the Portals mechanic.

...commentaries about the creation of [[Portal]], that can be found once the test subject has completed all the tests and finished the game. ...control of the test subject while they are playing). Take notice that the test subject can't get any achievement while testing in developer commentary mod