Oh yeah that's my comment about Sheepdog's one-go, I knew that was possible but I can't pull that off.

Looked again, @Omega got it the way I did it myself to get green out. I forgot to say that promo Atlas was doing Fast Portal to P-body.

I came up with the same solution as Bullfrog. However I could not actually get it out. The first time I was able to fling the reflective cube out after 3 attempts. Then I accidently fizzled it. This time the fling had 10 attempts and 10 failures. I have always had trouble placing a portal on the floor correctly in that situation. Otherwise good map thank you.

Yeah I figured that, @Sheepdog showed me similar, I thought players would be impaled I was wrong on that account, it works more like supermarket door with electric eye. I left this kind of play in since it is as clean moves as my intended play.

Unintended solution: https://youtu.be/PaGqpgGlQNM

Yes that is the intended moves.

I've not looked at ₴ⱧɆɆ₱ĐØ₲’s video yet, but this is what I did: intended solution ?

Oh first one I simply meant the same thing, I need to going in and position the cube and ... I can't manage a precision move in one go. The second part is essentially my definition of impalement danger, my intended solution does not call for a timing window. Can I put this link up as alternate solution?

No, you do not get stuck in the door. I don't know what you mean by "not as dexterous for getting cube out." As nothing I did was skill based. There was flinging the cube out at the beginning, but there is an easier way. Have the cube land, place a portal on the wall, place another portal under the cube, the cube will fall through the portal twice and launch past the fizzler. Or you can set up a infinite fall.
But what I did for the final step is aim the reflecting cube at both exit criteria, hold a directional button against the exit door, place a portal which sends the laser to the reflecting cube and to the exit criteria. The fizzle happened because one of the exit criteria is also connected to the reflecting cube. As long as the exit criteria is 'ON' for a frame and you are holding a directional button against the door, the door will open.

Oh not my intended, just another clean solution; uh isn't the last move liable to impale you on the Exit if you are not there anticipating the final move? It differs quite a bit further you go, I see cube-swap and I am not as dexterous for getting cube out. You maybe better to explain your own moves, I see a fizzling that I am not sure what happened there.

here is how I did it https://youtu.be/SsMSe28zoyU

Hmm, I do not know what I did was intended, I'll upload the video of how I did it.