It's Quake II. The one, the only. Well, to be more specific, it's a nice implementation of another open source engine of Quake II. All the bells and whistles you'd expect from a modern game come packed in, for the most part. Just copy your Quake II content in and you're good to go. I haven't even used the RTX mode cuz this is the best out-of-the-box way to play Quake II on Steam.

1) Download Quake II (and mission packs, if any) and Quake II RTX.
2) Copy content files from Quake II into RTX folder.
3) (Optional) When first loading the game, if you don't have an RTX card, swap the render mode over to `opengl`

It's Quake II. The one, the only. Well, to be more specific, it's a nice implementation of another open source engine of Quake II. All the bells and whistles you'd expect from a modern game come packed in, for the most part. Just copy your Quake II content in and you're good to go. I haven't even used the RTX mode cuz this is the best out-of-the-box way to play Quake II on Steam. 1) Download Quake II (and mission packs, if any) and Quake II RTX. 2) Copy content files from Quake II into RTX folder. 3) (Optional) When first loading the game, if you don't have an RTX card, swap the render mode over to `opengl`