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The one time I tried reaching it, I got blown by the explosion just before reaching it. If so, what does it say?

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up vote 12 down vote accepted

What do you mean "reachable"? If you can see it, you just need to hit use (E) to activate it, the range is virtually unlimited, and I don't even think it's hindered by line-of-sight.

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pressing Tab will teleport you to the next commentary bubble, and if you miss one it'll cycle through them all again. Not sure if that'll solve the problem of getting caught in the explosion, though.

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This can most likely be reached with sv_cheats 1; noclip, however, don't forget to turn off those cheats by using noclip; sv_cheats 0 if you still need the achievement for finishing Portal 2.

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Not true; I got an achievement in developer commentary mode. – Liquid_Fire Apr 22 '11 at 18:36
I received conservation of mass in commentary mode. – Theo Belaire Apr 22 '11 at 19:09

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