Thank you @chaosbyte_!

Thank you for making this level I really enjoyed it. It took me almost an hour to beat it, I loved the creative usage of self-activating mechanisms. Only after beating the level I realized it was created by you which I found cool because I already knew your YouTube channel before. It makes sense that a geeky guy like you would come up with a unique level like this :D

@Bisqwit Unfortunately I didn't take one, sorry about that.

@Bowsakirby Thanks! Do you have a replay video?

Brilliant!! An excellent lesson in the importance of power redundancy & failover, as well ^^

Thanks @PLUTON!

Great map. Really enjoyed it.

blind demo
Sorry for the pause bug at 9:10.

I've tried it twice after the demo.
Even if I can make the sphere go to it's place I still need the first laser, there's no way I can go across the water without using both portals.
I did figure how to get the sphere on that platform without using 2 portals using physics (I know I'm desperate and looking for the wrong solutions) but even then I still have to put in in the receptacle and I still need to be physically there.
I don't get this bit, I'll have to look harder for something else.

P.S. nice laser closed loop :D

Allright! I updated this map. It includes many small cosmetic updates, and a particular update to the section where the lightbridge problem was that you mentioned.

you only place one. two and yeah, almost impossible to put a portal there

I also tried placing some light strips on the sides of the portal magnet, but it only resulted it being nearly impossible to place any portal at all.

Yeah I found your portal magnet, but I still managed to get some other portals somehow. But I guess for all intents and purposes they work the same way

The spot where the laser hits in the ground is already guarded with a portal magnet. You can't place a portal on it except by one orientation only. You will discover this in about 3 seconds. Unless we are talking about some other laser in the map...? I'm sorry if I'm being obstinate here.
I will try to do something about the light bridge. I'm trying some solutions right now... Mainly involving some knee-hight obstacles that would stop the light bridge but still allow portalling and other actions... But I don't want to create a new platform for the cube, so it is involving.

Oh, i mean stick a strip on the spot the laser hits so that we can't place diagonal portals (as the strip reduces the size of the tile). It's not really necessary, but I doubt I'm the only one who tried to get the laser coming out of the bottom of that portal as the final step. I'm glad that didn't work though, your solution was better. And about the bridge, what I mean is that the bridge will hit the cube, lift it, and for some reason when the bridge is removed the cube will tip and break the connection, thus dropping you in the drink or at least resetting all progress. This is nasty because once you accidentally lift the cube, it's hard to make it safe again without losing the laser. You could fix it by changing the geometry so that the player won't ever line up the cube and the portal they use to get onto the bridge.

Thanks Ravoria! Really good feedback there. The light bridge goes through the door, and this is unavoidable. I decided to ascend that glitch. You can use that as part of the solution if you like; it is not necessary though. However, I can't figure out what you mean by the light strip thing. Could you illustrate it please? Lastly about the lightbridge: Yes, replacing the wrong portal and undoing one's lightbridge is certainly a nasty thing when it happens. That's why there are autosaves (and manual saves) though. If I ever get a bright idea to mitigate that, I'll see about it. I will check your map now!

Enjoyable test, though the light room was a bit overly annoying. It took me ages to figure out how to do the trick at the end properly, which was sad given I've used something similar. Felt really good to finally solve this. Only thing I can recommend is to put a light strip on the surface the laser in the white room hits, this will make it obvious that one (impossible) alternate solution is impossible. Also, I think this was intended, but the light bridge goes through the door; I've never seen that before. And if you can do something about the players accidentally killing themselves with the bridge by moving portal surfaces so the bridge doesn't nudge the cube, that would save people some time.
My map: https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=234519746

Thanks lord_dhaf!

Good work! Thumb up! Nice design and a good challenge. I had a good time with this one.

Thanks! Will add your map.

Well built and great map,thumbs up.Can u try my newest
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=173406612

That was great fun, here is my blind run (30min): https://www.dropbox.com/s/30wkp2ixruku9ds/darknessandlight.dem took me quite a while to realise that I didn't need the button in the middle, also took me a while to try interrupting the beam quickly , I didn't do the last bit like the video, although that would probably be easier.
#F4F Geltastic

Very nice map, Thumbs up! Feels good to have finally found the solution :) I was a bit surprised about the fact, that the reset did not affect the flippanel - but your walkthrough explained, why.
Maybe you want to look at this map , it needs some visitors :)

It's as brilliant as it is difficult.

On the topic of lag, I updated the chamber yesterday. There are now fewer observation rooms in that part of the level.

Hmm, that's odd. Maybe your display card has problems with rendering blurs (bloom). Do you also get a significant FPS drop in the PTI editor when you enter a menu or the chamber building? (When the background gets blurred.)
Since I have a low-end display card myself (NVidia G210M) and I always play at medium settings (2x antialias, medium or high effects, and medium or high shader; everything else maxed), but I haven't noticed anything peculiar about that room FPS-wise.
I did also play with an Intel GMA 4500M at some point, and it had serious problems with blooms (and transparencies), and I can imagine that light room being horrible with the GMA.

06.21.2013 i've noticed that the "light room" causes my fps to drop dramatically.. I've had to turn down my settings just to get a playable 25 fps

The bridge can disappear as you move the portal, if you compromise the position of the reflector cube that keeps the laser alive (the laser keeps the bridge alive).
The part in the beginning (laser training room) used to be a bit clearer before, but I realized that one can actually destroy the cube, so I had to do away with setting an initial orientation for the cube (which helps figuring it out) and used a dropper instead. Too bad you can't have both an initial orientation and the cube respawning.

Well, I started recording a demo but I died during the process (because the bridge magically dissapeared after I moved a portal -_- )... All I can say is that the part with a 1 ball and 1 laser cube at the beginning stuck me a moment, then I figured it out ^^ And after that I was able to place the ball on the ball button linked to the exit door, and I almost figured out how to activate the lasers correctly, but I gave up after messing everything once again and having to reactivate the lasers in the last room again -_-" Anyway pretty clever puzzle, well done ;)