This is a tool-assisted speedrun. For more information, see http://tasvideos.org/3402M.html. TAS originally published on 2017-05-25.
Super 3D Portals 6 is a bootleg demake of Portal for the Atari 2600 made by Hinchy from the TIGSource forums in 2009.
Don't blink, or else you'll miss the entire run from TASeditor (http://tasvideos.org/Taseditor.html) as he thinks with 2D portals!