I got to test chamber 18 before I needed to get help with Portal. That level is a mind bender and I didn’t have a clue what to do! Besides Youtube, there’s also portalwalkthroughs.com if you need help.
I have to admit, the supposed “end” of the next level was quite funny! 
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This reminds me that I should get the Orange Box with the GameStop GC I got for Xmas. Thanks