(see below)

Ah, you're not meant to be able to open the door that way. I can tell you that I tested this possibility thoroughly in early development to make sure it's not possible. However, the bug has found a way back in with changes I had to make later to the temperature model.
I've fixed this now (v1.15) by separating the door timer from the warm-up sensor. It should also be clearer now with the door timer just above the door and a ticktock sound. The door sensor now cools-down instantly and starts the 10s door timer.

I was sure I had the right solution this time. Surprises

almost_there
||1.) Use the standard Part 1 solution to get the four cubes in the funnel and the fifth at the top keeping the door open:

2012-01-31_00001.jpg

2.) Grab two boxes and spin around in place, placing them on the floor as follows. Make sure they're not covering the button. This should take about 3 seconds:

2012-01-31_00002.jpg

Save the game once you get this done well and quickly.

3.) Place a portal under the sky box to align it:

2012-01-31_00003.jpg

4.) Immediately walk off of the button and place other portal next to you:

2012-01-31_00004.jpg

The box should now oscillate between the portals. Don't take the time to check it, just continue on.

Steps 3 and 4 should take about 2 seconds.

5.) Now push the two boxes over to the door and bring them in. You should still have 4 seconds or so to do this successfully:

2012-01-31_00005.jpg

6.) Go upstairs:

2012-01-31_00006.jpg

7.) Unfortunately, the box is slightly out of reach....

2012-01-31_00007.jpg

8.) I tried moving it to the other side:

2012-01-31_00008.jpg

9.) But it's still too low. Obviously we're meant to use this slot for something - I was thinking this is the grab spot. But nope

2012-01-31_00009.jpg

||
Does it seem like this is on the right track though?

Ruien wrote:
Does it seem like this is on the right track though?

I tried precisely this in the solution I recently gave, but the end result was unintended. This doesn't mean that the cube is not meant to be oscillated, but at least what I did after that is wrong.

I was quite skeptical about that solution myself, and now I have a feeling that the cube-oscillating is not the right track. But that's just my opinion

@grayarea : Are those arrows in the narrow slits between the glass panels on the top intentionally provided by you?

Xtreger wrote:
@grayarea : Are those arrows in the narrow slits between the glass panels on the top intentionally provided by you?

Everything is intentional! (except for those thousands of unintentional things...)

Xtreger wrote:
I tried precisely this in the solution I recently gave, but the end result was unintended. This doesn't mean that the cube is not meant to be oscillated, but at least what I did after that is wrong.
I was quite skeptical about that solution myself, and now I have a feeling that the cube-oscillating is not the right track. But that's just my opinion

Err.. the problem with that solution as far as I saw was that it opened the door using a trick that had now been fixed- my method was to show that such a trick wasn't necessary. I didn't see anything related to the oscillation itself which would suggest that that isn't the right approach.

But now I think you're right - because there doesn't seem to be a simple way to grab the cube, so there must be another way.

The narrow slit with the arrow must be a clue that you are supposed to shoot a portal from this direction on the floor below the laser. Is it possible having a bouncing cube hit all three receptors going up through the fizzlers and catch it at the top? The problem seems to be not having vision on floor panel from above the fizzlers. Edit: maybe there is enough time to run from the arrow near the big fizzler?

Or even better: Jump after it! Yes that must be it. Very cool solution!!!

Arrows now make perfect sense. When cube is in air at arrow at narrow slit, you jump from other arrow. The timing required seems to be insane though...

Have you actually done this?

jonatan wrote:
Or even better: Jump after it! Yes that must be it. Very cool solution!!!

Arrows now make perfect sense. When cube is in air at arrow at narrow slit, you jump from other arrow. The timing required seems to be insane though...

That is a cool solution indeed if there's a consistent way to pull it off.

The laser grilles covering two of the portal surfaces make it so that the only way to jump in is near the the wide slit and emerge from beneath the fizzler stack (anything else will kill you). But you also need a laser beam, so shortly after emerging, one of the portals needs to be under the laser.

I assume the arrows are intended to give you the portal directions for aligning the cube's rotation as it enters and exits the portals so that it can hit the laser receptors at the right angles. That doesn't really work though because we can't assume an initial orientation for the cube, so it means there needs to be some calibration (like aim toward the first receptor) and then the angle difference is to tell you how to point the cube correctly at the second and third receptors.

I tried to do something like this by arranging the portal angles so that the laser beam hits the first fizzler's laser target on the way down, and then emerges under the fizzler at the right angle to point the laser at the second two fizzlers. But you need to place two portals very rapidly (one immediately after the cube falls past the first receptor, and a second immediately after it emerges from below the fizzlers. But that's way too hard to do, so it can't be right. And as for jumping after it, i can't shoot portals while grabbing and trying to aim the cube. So that's pretty much impossible too.

Yes the laser portal is needed so the timing window is to shoot yourself up from the floor under the first fizzler exactly when the cube just passed the third fizzler. You then have to catch it before it crashes into the third fizzler again... But I don't think the cube will have enough height. Especially since you need to travel upstairs and calibrate the portals. Running also seems to be too slow, but I haven't tried it. Suppose you shoot a portal under the fizzlers just after the cube fly up from the portal under the laser. You then start running, possibly using strafe jumping to get extra speed. The cube will go up and down and then up again through fizzlers. Will there be enough time to reach the fizzlers and grab the cube before it crashes? Possibly?

I thought I was getting closer, but now it seems that I'm hopelessly far way.

- My solution to the first part had 3 cubes in the funnel, not 4, and grayarea said that was right.- When I drop the cube from on high, it bounces off the sloped glass panel. It will not drop through the floor!

Yet Another Useless Solution
P4i7yVl4xwE

http://youtu.be/P4i7yVl4xwE

As usual this may turn out to be completely unintended.

On a side note, jonatan's earlier suggestion of making the cube land on the small ledge (near the wall portals) by rapidly shooting tractor beam portal and then suddenly removing it does work (I succeeded in doing so recently). Unfortunately it's no longer relevant...

Hah! I already told you you're not meant to be out on that vent!
Really amazed that you found a way to ninja back onto the ledge from there though.
I'm just not a skillfull enough player to rule out that kind of move. Not yet anyway, but I've just about earned a degree from the School of Xtreger map-breaking Academy.

Edit: I actually found Jonatan's funnel-cube-fling onto the ledge to be easy and a very cool move. I'd like to use it in a map but I guess he has a patent on it now. It seemed to work easily with just 3 portal placements. First one a little to the left, second one a big step to the right and third one to break off the funnel.

@Xtreger: That video is both classic and hilarious. Good work.

grayarea wrote:
Hah! I already told you you're not meant to be out on that vent!

Ah sorry... I forgot about that. I'm only posting these solutions in the hope that they might have some things in common with the intended one.

I got it!

And it's so simple.

so_simple
||1.) oscillate the laser as shown in my previous post.
2.) Go over to the small slit and shoot orange portal on the floor at exactly the arrow's orientation.
3.) Come back to the main window and rotate the blue portal repeatedly to orient the laser so that it hits the first receptor as it falls:

2012-02-01_00002.jpg

4.) Just as it falls past the receptor, change the blue ground portal to under the fizzler stack. The arrow orientations guarantee that the angle delta is exactly correct to hit the other two receptors:

2012-02-01_00003.jpg

5.) Run over to the fizzler stack as soon as you place the blue portal. You'll get there just in time to receive the cube. I didn't get enough height on my trial but it's definitely possible (I lost too much momentum over time testing).||
Woot!

@grayarea: This is the intended solution. Right?

Certainly interesting. Does it work though? I'm a bit confused, from the final screenshot it doesn't look like you would have a chance in hell of running over and catching that rising cube?

grayarea wrote:
Certainly interesting. Does it work though? I'm a bit confused, from the final screenshot it doesn't look like you would have a chance in hell of running over and catching that rising cube?

Darn - no, I underestimated the amount of height lost by the cube coming out from below the fizzlers- since it's not coming out from the platform portal (which is higher in elevation) you are lacking just about 0.75 seconds to grab it.

But it seems that this is the right approach. Also, if Portal didn't lose momentum randomly (supposed to be air resistance?), this would work.

So you're saying that you shoot the final portal while the cube is falling past the first fizzler sensor and then can almost do the entire run while the cube rises from the portal through the fizzler stack?