Valve's First Attempts at 'Harder' Portal Test Chambers

Portal 1's Advanced Chambers are a fairly interesting piece of post-game content to explore once you've finished the main campaign, or if you're attempting a 100% completion run of Portal. So in this video, I aim to explore the original versions of the Advanced Chambers found in the Portal 1 Beta files.
Credits to @wolfcl0ck for helping me distinguish the eras these Advanced Chambers come from!
Also check out @RichterOvertime's recent collab with me, talking about the cut Xen Ending from Portal 1! - • Portal 1 Cut Content -...
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Hey everyone, the name's Ossy Flawol!