To pass the "4-switches" barrier on Doom II map Nirvana:

First, Activate all four switches, and then walk up to the
raised platform and Activate it like a switch.  The edge of
the platform will drop down momentarily, allowing you to
get on and ride up.  From there, you can simply walk down
to the far side of the room.

PC Doom2 players can click here to access a demo that shows
how to get past this barrier.

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