Portals

Outside Aperture - Portal Short Film https://www.youtube.com/watch?v=NorZUFfpvC0

Portal: Survive! https://www.youtube.com/watch?v=0x2l0NgSvyM

Portal: No Escape (Live Action Short Film by Dan Trachtenberg) https://www.youtube.com/watch?v=4drucg1A6Xk