I did some steps differently. As @The Sojourner said, it's not entirely obvious that propulsion gel needs for the last step.

definitely needed a little help noticing things on this map. very cool playtime

P.S in case You or anyone else is interested, I recently made a map with a similar layout(didn't steal, promise), though it takes a while to get to that part. There is no old Aperture, it's less sandbox-y and has a harder puzzle, but someone might enjoy it :P
http://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=974874135

Great map! I only really did the start, funnel ride to blue button and second old chamber as intended, everything else in a different way. It felt like a sandbox with stuff conveniently thrown around, not a bad experience :P First time around, I did what sentientcloudwastaken did: painted the roof right away. I overshot but by little enough to still get to exit the first time, but too much every other time i tried to repeat it(it was only posible cause gel acted weirdly and painted to the side. Should be an easy fix, but the map is too old for that, I assume). Dislike invisible walls a lot, so I got onto the walkway using blue gel and to the other half of the roof. Wasn't easy, but "ha!"
Loved the visuals and all the work that went into making this level! Make more! <3

I looooove this map!

So... I solved it without visiting the second old test chamber and I didn't need the funnel to get the blue gel. Also I totally overshot the exit.

This is awesome

Holy crap this one has intensive Hammer usage! This is a very ambitious map you created. I got stuck a few times just because I never saw anything like it before or I just didn't get what to do to get there. Just curious, did you export a map from the in-game editor and make it crooked in Hammer? I also felt the entire playthrough was of random difficulty. Like it starts off pretty easy, then it gets hard, and then it gets easier, all in the same map. I did have to peek at the solution video a few times because of the unusual level design.

Hello again. Just checking out some old tests on my new system. This one is especially memorble :D

Perhaps I wasn't specific enough last year as to the confusions...
1) I found a convincing near-solution that involves an angular fling out of the new test chamber and off of repulsion gel.
2) As for accessing the gels, I didn't quite need the gels the same way you did. I found I could use propulsion gel instead of repulsion gel in some places (or even no gel at all). As such I didn't need the old area nearby the new area at all.
3) It's not entirely obvious that propulsion gel is needed to exit by running off of the top of the test chamber.

Guys, you have to think logically. Start at the exit and work your way backwards. Hope that helps. The exit is the one in the modern room.

Beautiful map. Simply Amazing. Favorited.

I found it confusing. Love the theme, but could use maybe a few more hints as to where to go and what to do.

Damn Layne that was the hardest and longest map I've ever seen. I had to follow your video and it was still hard, I did some things over and over. Hey but I stuck to the end and made me feel real good to see all that stuff. I really don't know how you came up with all that but thats some really nice and wild playing. Thanks a million. I'll come back another day and try it on my own. LOL like my mind can remember all that. :)

Loved the old meets new. Totally cool. I don't think it was too hard so much as it had more going back to do stuff then what I like. Lead me to blow off reconizing the finish line for anything more than decoration for a while.

Sorry wanted to like this but far to confused,so a thumbs down from me.

Too hard by about a factor of 10 for my brain.

Yuck ... sorry, that map is too complex for me and watching the walkthrough just confuses me more.
Even if I don't like it because of complexity I have to admit that's good work.

yeah the false clues/red herrings, for example the button on the wall or the other button by the boarded up 'exit' in the 70s area. When I first started the map I decided that i had to find two cubes to activate both buttons in the tilted area to access the exit.

I think it's that the important stuff is too camouflaged by false clues. Plus you kind of have to run around in circles to make sufficient progress.

was there any one part in particular where the map fell apart for you?

I completely agree with Warbear.

ok i've done it :) Horray! Thanks for the video walkthrough, it and the text totally helped. Great map, maybe it could do with some arrows as i was mostly getting stumped by 'where next' issues, or 'too many variables' !!

Sorry, the walkthrough is totally baffling. I love the map's look and concept. The new style makes me a little dizzy with the gravity and oblique angles, but it's a great idea and look. I just can't figure out the puzzle even with the walkthrough. I think it's a bit too complex.

The walkthrough is six posts long and under this post in order. If its worded badly thats because of the character count, or more likely im just awful at making walkthroughs. If it doesnt help feel free to ask.

1.Box To Corner-
At start go to the "gel room" of the old test chamber where the gel droppers are. Place one portal under the speed gel and place one on the wall facing the ramp and spray the gel on the ramp. Place the box on the button next to the ramp opening access to the "raised platform." On here place a portal on the wall and another portal on the wall back at the gel room. Follow through and place the portal at the speed gel and activate it. While spraying run to the raised platform and move the portal around to spread the speed gel. Now run down this to the "corner platform" and place a portal on the wall touching the floor. Go through the portal bringing you to the raised platform and shoot a portal on the gel room wall. Go to the corner platform to bring you into the gel room. Shoot a portal under the speed gel and spray. Now get your box to the corner platform by placing a portal on the wall facing the ramp and using the lowered ramp with the box.

2.Center Platform-
Now with the box on the corner platform, look into the “new chamber” to find the portal surface that's facing the broken ceiling and place a portal here and on the speed ramp. Go through with the box and walk over to the button and place the box here. With the traction beam in reverse shoot a portal on the floor of the raised platform and move to the runway on the corner platform. Run through it and look at the new chamber and shoot a portal at the end of the traction beam. Shoot a portal on the concrete supports and use the speed gel here to get into the beam. Ride the beam until your in the line of the other concrete support's portal surface and place a portal here. Ride this beam until your in the pathway of the "center platform's" portal surface and place a portal here. Ride this beam through the portal and up to the box. Grab it and jump back into the beam and ride it into the center platform.

3.New Button Redux-
Place the box on the button here which will activate the blue gel as well as a rotating wall. Go to the raised platform and place a portal under the blue gel. Spray the gel on the ramp by using the gel room wall and spray the gel on the floor around you. Jump on the hanging platform and place a portal on the rotating wall to place gel on the center platform and place a portal on the most lower white wall of the new chamber to place gel at the edge of it. Jump on the corner platform and place a portal on the white wall thats under the fizzler (not the runway) to shoot gel on the this platform. Go to the new chamber and use the newly placed gel to jump on the roof of the corner platform. Fall on the placed gel below aiming for the center platform. Grab the box and go to the runway on the corner platform and bring yourself back to the traction beam button the same way as before. Place the box here and go to the corner platform's roof.

4.New Exit-
Using the blue gel jump straight up and shoot a portal into the traction beam. Place the portal in the gel room wall and ride it to the room. Place a portal on the same wall but in line with the gel droppers. Use the blue gel here to reach the beam riding it into the portal. Leave the beam. Jump on the corner platform's roof again go to the center platform. Now step on the button and watch the gel riding through the beam. After a moment quickly walk to the center platform wall and place a portal on it carrying you in the beam. Ride it and fall on the button platform and grab the box. Fall off this button and place a portal on the white wall near the new chamber's exit. Once some gel goes place a portal elsewhere to drop the gel. Go to the platform across the drained water and use the gel placed there to jump on the platform to your right. Now use this platform and jump back on the gel into the exit platform.

5.Upper Chamber-
Go through the backstage area eventually bringing you to the roof of the new chamber. From here fall on the truss and walk along it, falling on the gel on the center platform, until you reach the walkway and follow this to the upper chamber. In the upper chamber place a portal on the blue gel and place the other on the white wall in the center of the room. Stand on the button, rotating this wall, and place a portal back on this wall shooting gel. Jump on the gel to the raised platform jump on it again from here on the walkway. Follow the walkway to the first gel you placed and jump on this aiming for the platform up here. Grab the box and bring it to the button. Now jump on the raised platform by the button and look out the empty wall. You will see the white wall sitting on top of the new chamber and shoot your portal there. Walk over to the white floor next to where you obtained the box and place a portal here and go through it.

6.To End-
From here you can find the rotated wall in the upper chamber and place a portal there. Walk back along the truss' but instead of taking the walkway continue on the gel room. Place the other portal under the speed gel and spray it. Now go back to the roof of the new chamber by placing a portal on the wall of the raised platform facing the gel room and running along the ramp bringing you back into the upper chamber. Jump on the gel and place a portal on the white wall on the new chambers roof and placing the other portal in the white floor. Follow through the portal and line yourself up with the building across the chasm. Run along the speed gel and use the new chamber as a ramp, bringing you to your goal.

The full walkthrough will be posted some time tonight as i'm having character issues. To e1craz4life, the one in the enrichment sphere.

Which chamber? The enrichment sphere or the one that smashed through the shell?

can we have a walkthrough posted ?

e1craz4life - the repulsion gel is activated by the button in the center of the chamber
danielshute - the door is broken and you must use the exit in the new chamber

This is my favorite test chamber so far! Wonderful work!

ok this is a great map, but where do you go once you put the cube on the button, like in your 3r d screenshot?! Great idea, mixing up the test elements!

How does the repulsion gel get activated?