"Doom," released in 1993 by id Software, is a groundbreaking first-person shooter that influenced the gaming industry and inspired many games in the '90s. Its sequel followed a year later, along with various ports and spin-offs.
"Wolfenstein 3D," released in 1992, was id Software's earlier success that laid the groundwork for first-person shooters with its maze-like level designs and fast-paced action.
"Heretic," created in 1994 by John Romero and Raven Software, introduced a medieval dark fantasy theme and a more complex inventory system, expanding the boundaries of first-person shooters.
"Duke Nukem 3D," released in 1996, transformed the titular character into a first-person shooter icon, known for its crude humor and explosive gameplay.
"Quake," launched by id Software in 1996, emphasized multiplayer gameplay and introduced true 3D graphics, redefining the possibilities for 3D shooters.
"Serious Sam: The First Encounter," released just before "Halo: Combat Evolved," features protagonist Sam Stone battling extraterrestrial foes with a focus on over-the-top action and competitive multiplayer modes.