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Portal 2 Hints
Neurotoxin Generator
1 of 5: Move along the walkway until you get to the huge neurotoxin generator chamber, then keep going until you reach an airlock.
2 of 5: Past it, you can view rejected turrets being dropped into a vast grinding mechanism. Past that, enter the small lift and ride it up to a higher walkway.
3 of 5: When Wheatley starts talking about opening the door labeled "Implosion Observation Annex," look around for a way to do so.