Oh man, I made this years ago and am unsure what the answer is.
I have a vague memory of flying though 4 portals to create the perfect momentum to land on the bridge, it was about making sure you don't over shoot or undershoot...

I've got zero clue how you're supposed to do the final chamber without using the glitched jump pad. The one that isn't glitched is super inconsistent as well, which makes it extraordinarily hard to troubleshoot. Even using 4 portals to get as much momentum as possible, we were unable to find an exit location that would land us on the bridge.

In the last room, we found a bug (or not a bug) with a jump pad that launches you in the direction you are going. This way you can reach the exit

Google translated

I have no idea what I was meant to do in that last room :(

Blind Run: https://youtu.be/K6al3z6MRB8

Wow thank you. This is a very old map, I'm not even sure I remember what it consists of. I'm glad you enjoyed it. There's two more to follow this if youre interested. https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=190392215

the hoopy hoopy things are a bit weird, nice map overall

Thank you for playing and taking the time to type out feedback, youre awesome.

Indeed that is the case. It would be nice if Valve had made things like that more consistant. I also found it to work if you jumped directly into the center of the jump pad - while always looking at the portal youre heading toward, yet another weird physics variable.

A friend and I used a cheesy mechanic to complete the last room.

The originally intended 4-portals-momentum-thingy didn't work properly due to the jump pads not being consistent in where they throw you, but the idea is nice.

The cheese (SPOILER):
Approach the jump pads diagonally. That way they throw you off the mark and at an angle. It's fiddly, but it's still less frustrating than putting up with the jump pads' inconsistencies.

I'm unable to go in and check this map because I lost my old harddrive, but if I remember correctly it's the one really big room with a bridge-thing. If that is this the case a good tip with out spoiling it would be: You both must travel through all 4 of your portals using momentum!

If that wasn't helpful at all I will post the solution later on by playing it with my firend when he is available.

The first two rooms were tough and we managed them, but after two hours we cant't figure out room 3.
Any tipps?