Portal Revolution is a sequel after the initial test subject killed GladOS. You wake up once again in a strange experimental chamber as another test subject. The modding community has created some new features not seen in Portal or Portal 2 and some new A.I. characters who help along the way.

https://store.steampowered.com/app/601360/Portal_Revolution/

Portal Revolution ran perfectly in Linux as a stand alone Linux native game. I never had any performance issues or crashes... it was extremely fun and only a few puzzles required searching online for a solution. I love the bot voice-overs and the new character plots. I can't believe Valve has not created a new Portal with some of these new laser and Pneumatic vent features! Thank you Portal community!

Mint 21.1 64-bit
GeForce GTX 1650
Nvidia 535
Proton Experimental 8