Facts Doom (1993) Original Doom engine. Today: play via GZDoom, Crispy Doom, or Doom + Doom II (KEX re-release). Doom II: Hell on Earth (1994) Original Doom engine. Same play options as Doom. Doom 64 (1997) Modified Doom engine. Released for N64; re-released for modern platforms in 2020. Doom 3 (2004) id Tech 4. Heavy reboot — closer to a survival horror than classic Doom. Re-released as Doom 3 BFG Edition. Doom (2016) id Tech 6. The successful franchise reboot. Fast, gory, melodic. Brought "Doom Slayer" canon. Doom Eternal (2020) id Tech 7. Builds on Doom 2016 with platforming and resource-management combat loops. Doom: The Dark Ages (2025) id Tech 8. Medieval-tech prequel.