Doom Zero

Doom Zero is a 32-level megawad for Doom II, using DeHackEd to introduce new monsters, created by Christopher Golden (DASI-I) of Iruka Software. It was originally released on September 30, 2019 for the 25th anniversary of Doom II's release, and was given the status of runner-up for the 2019 Cacowards. It has a particular focus on platforming and switch puzzles. On December 15, 2020, it was added to the list of official add-ons for the Doom re-release. Further updates happened in 2021, leading to version 2.2 on March 9 and the current version 3.0 on August 24.

Monsters

 * The alpha soul, which replaces the Wolfenstein SS, uses the early graphics of the lost soul from the Doom press release beta, has 100 hit points and attacks by shooting cacodemon projectiles which, interestingly, can damage cacodemons. (In early versions of the mod, it was referred to as "soul droid" and had kept the hitscan attack.)
 * The demon witch, which replaces Romero's head but is non-shootable. Instead, its vulnerable heart replaces the tall blue torch, with 500 hit points.
 * The Commander Keen sprite was replaced with a Dopefish one.

Soundtrack

 * MAP01: Remix of "Suspense" ("Hiding the Secrets" in the official add-on)
 * MAP02: "At Doom's Gate"
 * MAP03: "Countdown to Death" (unchanged)
 * MAP04: "Into Sandy's City"
 * MAP05: "The Healer Stalks"
 * MAP06: "They're Going to Get You"
 * MAP07: "On the Hunt"
 * MAP08: "The Dave D. Taylor Blues" (unchanged)
 * MAP09: "The Demons from Adrian's Pen"
 * MAP10: "The Demon's Dead" (unchanged)
 * MAP11: "The Imp's Song"
 * MAP12: "Sinister"
 * MAP13: "I Sawed the Demons"
 * MAP14: "Demons on the Prey"
 * MAP15: "Running from Evil" (unchanged)
 * MAP16: "In the Dark"
 * MAP17: "Doom"
 * MAP18: "Kitchen Ace (And Taking Names)"
 * MAP19: "Dark Halls"
 * MAP20: "Sign of Evil"
 * MAP21: "Waltz of the Demons"
 * MAP22: "Donna to the Rescue"
 * MAP23: "untitled (E2M9/E3M1 theme)" (Doom II intermission in the official add-on)
 * MAP24: "The End of DOOM"
 * MAP25: "Adrian's Asleep" (unchanged)
 * MAP26: "Message for the Archvile" (unchanged)
 * MAP27: "Waiting for Romero to Play" (unchanged)
 * MAP28: "Suspense"
 * MAP29: "Sign of Evil (Redux)" from Project: Doom ("Sign of Evil" in the official add-on)
 * MAP30: "Nobody Told Me About id"
 * MAP31: "Evil Incarnate" (unchanged) ("Deep Into the Code" in the official add-on)
 * MAP32: "Opening to Hell"
 * Intermission: "Intermission from DOOM"

Built-in demos
Version 3.0 of this WAD features three built-in demos. All require Doom II v1.9 to view them. The demo levels are:

The v2.2 release included the following three demos:

The v2.0 release featured the following three demos:

The v1.8 release included the following three demos: