This is the path to find the hidden Developer HQ for the achievement on Plaza.
Once in the lobby area you will see a right wall and left wall (kind of like two big blocks).
Go behind the right wall and you will see little platforms hanging from the ceiling.
Fly up on top of the platform closest to the wall and look at the vent.
Once at the vent, press ‘E’ on it to enter. Now you should be in the Dev HQ! ;D
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