Completing Chamber 17 in 2 portals. This is the least I've done it in, 0 is possible with the wall climbing glitch but I haven't been able to get that right.
i can do it with no portals, there are some cameras already down in the hidden room where the "the cake is a lie" guy left messages and such on that level.
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Stumble it! 
I can do it in 0 portals NOCLIP!
LOL nice mate you realy do Hax O.J but there i9s 4 more in that other room why not use them?
woooow u guyz must be adicts to portal to think the cube for real!!!plus in Gmod it killz u!!!!!!
You could have at least paused a second for the death of a companion...
Dude why did you kill the lovable cube without hesitation........ass
amazing, never thought of that before
You can't get to those cameras without using a portal. The only way to do it in 0 portals is to use the wall climb trick.
i can do it with no portals, there are some cameras already down in the hidden room where the "the cake is a lie" guy left messages and such on that level.
That was awesome