Sandalo
Level: Delver
Rank Points: 47
Registered: 01-25-2008
IP: Logged

I'm entering from SE, which I assume is the only entry to complete the room.
I think I have to carve a path for the brained roach, so it presses the four needed plates.
It's easy to unbrain it closing the four corners with glasses, but as soon as I open one of them, how to build such a path?

Nuntar
Level: Smitemaster

Rank Points: 4590
Registered: 02-20-2007
IP: Logged

It takes three mirrors to seal off one of the corners -- only one to seal off the long corridors between them. That saves you enough mirrors to block certain passages in the interior.

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50th Skywatcher

kieranmillar
Level: Smitemaster
Rank Points: 2670
Registered: 07-11-2014
IP: Logged

If you're not bothering with the challenge, just set up the mirrors before letting the roach out.

If you are doing the challenge,

Sandalo
Level: Delver
Rank Points: 47
Registered: 01-25-2008
IP: Logged

I'm missing something (I mean, surely I'm totally blind)

As soon as I press 20,5 plate, all the upper doors close, and I cannot move any more (well, I can step on the 21,5 orthosquare, but...)

Your hint assume that I move mirrors while in the main part of the room, but all my job will be vanished when I close the 4 upper doors.
What I'm not seeing?

kieranmillar
Level: Smitemaster
Rank Points: 2670
Registered: 07-11-2014
IP: Logged

The multi-use pressure plates open those 4 doors. You need to have the roach press them after you enter the Northern brain chamber and close the doors.

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[Last edited by kieranmillar at 09-22-2014 08:16 AM]

Sandalo
Level: Delver
Rank Points: 47
Registered: 01-25-2008
IP: Logged

Got it
what I couldn't see was (spoiler):