I agree with BEARD on pretty much all points. I found it to be a challenging puzzle. I also got stumped at the same part he did, and I also solved it in a way that I'm pretty sure wasn't the intended solution. I basically used the portable surfaces on the ceiling to drop to the floor and then use that momentum to shoot out from the floor and shoot portals over the center fizzler. If that's not the right way you could prevent that by making the center class taller so there isn't a gap between it and the ceiling to shoot a portal through. regardless I thought it was a really good map.

Great map, thanks for sharing

I'd like to know how you played it before PTI.

I played this prior to the PETI editor. It was a great map then, and a great map now.
This is a thinking test. Great job.

vfig.ps, how do I look at your demo?

Congratultions on a well-designed puzzle. Nothing was artificially difficult, and I really had to think throughout - the sign of a quality map. It's impressive that you made it as a pure-PTI map, too! I liked the laser puzzles, which thankfully weren't your typical 'power 10 relays at once to win' job.

My biggest stumbling point was working out how to get the light bridge and two cubes past the fizzler . I did this in a slightly ninja way: I placed the lightbridge as high as possible in the first room. I jumped on the upper light bridge, redirected it into the second room (shooting above the glass) and landed on the lower 'source' light bridge. . In truth, it didn't feel like that was intended as a solution.

All in all, a high-caliber map that I really enjoyed. Thanks for mapping!

Brilliant! Although, if I could make one suggestion, using the light bridge might not be quite as bad if the laser was moved to the far edge of the tile from the wall. (If it's already there, ignmore this.)

Great, I've solved it now. Demo (if you care) is at http://dl.dropbox.com/u/571452/ym/feedback2.zip

I still didn't use the switch that opens the angled walls , and I used an unconventional method to bring the second cube over--though I could probably have just used portals, I suppose.

Ah vfig, I didn't realise it was only single use. It looks like that high area at the back was the element you were missing since early on in demo #4 you had the lightbridge and laser mechanic correct.

UPDATES:
-Fixed single-use button allowing players to be trapped
-Slight white/metal changes to eliminate one false solution and make correct more obvious
-Minor cosmetic changes

Ah, thanks. That might need to be a bit more obvious though. It may also be what I was missing to solve the puzzle.

(However, it is still possible to get stuck in the little chamber with the laser in the second room, as my first demo shows. There is no way to portal out of it.)

It's not actually possible to get stuck in the second room
Portal up to the back corner and look over the glass then use portals to get back into the first room

Well, I couldn't solve this one at all. I felt like was on the verge of a solution for a long time, but could never pull it off. I could never get the sequence of bridge and lens cube and portals was always.

I recorded four demos here: http://dl.dropbox.com/u/571452/ym/feedback.zip

The first demo shows me getting irrevocably stuck in the second room. This happened to me the first time I played the level--I accidentally lowered the cube as I was going through the portal, and it was on the other side.

The second and third demos are me attempting to figure out the parts of the puzzle. The fourth shows me still attempting to end up with two lens cubes and the bridge in the second room--which as far I can tell is a prerequisite for success.

At the end of the fourth demo, I again manage to trap myself irrevocably in the second room, but in a different way again. I seem to be good at that.

You can solve this puzzle without interacting with anything in the second room...

Minor cosmetic changes

@Xiagu That is not the most streamlined way to do it, but the end result is correct.

UPDATE:
-Skipping the second half by wall climbing isn't possible anymore.

(SPOILERS)
Uh... So after messing around without the light bridge for a while, I realized that I definitely needed it to get to the exit. Is the portalable surface opposite the laser reciever that turns on the light bridge one tile too high? It didn't match up with the light bridge target, certainly.

I eventually turned on the bridge by dropping a cube facing the target onto a laser on the same level as the target (in the first half, on the raised area with the extra cube button caged off). Then I took the second cube (from the second half) and carefully placed it on the light bridge, aiming at the light bridge target, under the ceiling laser. I'm pretty sure this wasn't the intended solution.

Armed with a new cube, I turned off the fizzler and proceeded to completely bypass the second part of the puzzle by light bridging up the walls. Maybe the wacky solution to turning on the light bridge was intended, but I don't think that was.