First person shooters have been the dominant genre in gaming for three decades and the debate over the greatest ever made is one of the most contested in the medium. Half-Life 2 combined gunplay with physics puzzles and environmental storytelling in a way that no FPS has fully replicated. Halo: Combat Evolved invented the modern console FPS and introduced the regenerating health system that every shooter since has copied. Counter-Strike has been the world's most played competitive FPS for over 20 years — a game of such elegant simplicity and competitive depth that it has never been surpassed. Doom invented the genre in 1993 and Doom Eternal reinvented it in 2020 with movement-based combat of extraordinary intensity. What is the greatest first person shooter of all time?