What is the use of the lever at the end of level 4?

Question

Almost at the end of level 4, when I finished beating up those green monsters, I found a lever in one of the corridors where the creatures were enclosed in... flipping it does not seem to do anything. Does anyone know what its effect is?

Asked by meo

Answer

Apparently, that lever re-activates the portals in the four corners of the main room you were in. I'm too far down to double check the source though.

(Source: http://www.gamebanshee.com/legendofgrimrock/walkthrough/level4.php, section 3)

Answered by fire.eagle

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