This Chamber is a real beauty. It is split into a few smaller pieces - mini challenges, if you will. It'll probably take you a bit more time than the last two.

Part of a 5 set.

Click here to download daT's Chamber #5

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The workshop map says "Hard", wasn't hard at all honestly. It was just a series of buttons and portaling in order. It didn't flow well at all. Most of the chamber was just pointless. Took me about 5 minutes.
Did a speedrun in less than 2 minutes. Didn't need to take out any of the turrets. Didn't need the laser or redirection cube.

Don't think this map was tested very thoroughly. I skipped over, what I'm sure is a large part of the map. I was able to bypass the whole back portion of the map and finish it in about 1.5 minutes without trying to do a speed run.