I took a deep-dive into the history of the first Portal game; why and how it was created, in other words. Ever wondered, for example, about Portal's first prototype, named Narbacular Drop? If you want to learn more about all this stuff, check out the video!
https://youtu.be/CKUGz1hRgFE
https://youtu.be/CKUGz1hRgFE