A quick video on how to complete my level in Portal 2 called "Clipped Between Realities"
This is a quick test showing that going through a portal and dropping a cube on your head at the right time can push you through the floor, which can result in the player going out of bounds. If the player then lands on a ceiling, they can clip back inbounds by saving and loading.

Download: https://steamcommunity.com/sharedfile...

Mods Used:
RGB Portal gun: https://gamebanana.com/mods/302217
Clean Portal Gun Normal Map: https://gamebanana.com/mods/322210
Refractive 3d Doors (Original, Currently Unavailable): https://gamebanana.com/mods/393780
Refractive 3D Doors (Reupload): https://gamebanana.com/mods/473400
HD Loading Screens: https://gamebanana.com/mods/28035
Source Auto Record: https://github.com/p2sr/SourceAutoRec...
SRConfigs: https://github.com/p2sr/srconfigs