This isn't really convincing. The P, G, R and Y are significantly different and appear in both the Quake sample and the font sample. S is significantly flatter.

This isn't really convincing. The P, G, R and Y are significantly different and appear in both the Quake sample and the font sample. S is significantly flatter. The cherry-picked examples are the most basic letters and likely to have parallel evolution because of the constraints of that design space. I think it's more likely to be a hand-crafted font, inspired by the general layout of stencil letters but no more than that.