Noun - A First Person Shooter video
game made in the 1990's, or such a
game released since then that is characterized by the same conventions of the
time.
Examples can include Wolfenstein 3D, DOOM (1993), DOOM II: Hell on Earth, DOOM 64, Duke Nukem 3D, Shadow Warrior (1997), Blood, Quake and Quake II, DUSK (2018), etc.