Portals with an impossible shape (cylinder, Mobius strip, knot)
43:08
Every Softlock in Portal
21:37
What happens if you put a portal in a portal? Simulation and explanation
21:46
Surface-Stable Fractal Dithering Explained
17:33
There's a NEW PORTAL that ADDS A FOURTH DIMENSION!? Portal Reloaded!
10:56
The Humanly Infinite
19:08
Why the music will be SO MUCH BETTER on Marble Machine 3
27:55
I built an Omni-Directional Ball-Wheeled Bike
22:56