Doom and Wolfenstein 3D may never have happened if a developer hadn't almost fallen out of his chair playing their poorly selling FPS Catacomb 3-D.
While Wolfenstein 3D is often considered the origin of popular FPS games before Doom then sent the genre into superstardom, neither were the first FPS that id Software made. Tank-based shooter Hovertank 3D was the studio's first dip into the genre, while Catacomb 3-D was the studio's first foray into a character-based FPS.
