Quake1 was my first love. From the old DOS version to the GLQuake to grappling hooks on Trinicom. I was amazed not only by said demo system but by QuakeC, and how heavily it was used, especially in college communities. I remember MIT and UWisc both being unreasonably productive modders in said language.

As a kid, I couldn't wait to see what came next. Sadly, Q1 was rather one of a kind, and it was many years until anything else like it showed up.