Early 3D arcade game using vector graphics.
With its use of three-dimensional vector graphics, the game is considered to be the first true 3D arcade game that has a first-person perspective, the “first big 3D success” in the video game industry, and the first successful first-person shooter video game in particular.
It got ported to every other thing, and most of the screenshots I found are from the ports to raster computers. I think this is a photo of the vector one,

Guessing here but I think the colors came from simple colored filters over the monitor. So the red score area just had a red film over it etc, and the arcade HW couldn’t do color.
Cabinet,



I definitely wasn’t that good at it, but I was just a lil kid. At the time the graphics made a big impression on me though.