Portal 2 PeTI - "Cosmogony 6" by  DreëY and Aleš Pěnkava (finale)
Channel: LB
Date: 2016-03-12

https://steamcommunity.com/sharedfiles/filedetails/?id=257511199
Blind playthrough.

This video is also on Twitch: https://www.twitch.tv/lb___/v/112092520