Sigil II, a brand-new unofficial 6th episode for Doom by John Romero, coming December 10th

On December 10th, the Doom franchise will be celebrating its 30th anniversary, marking its debut all the way back in 1993 with the first game, and to celebrate the occasion, John Romero, one of the legendary developers for the original Doom and Doom II, has been working on a follow-up sequel for

John Romero marks Doom's 30th birthday by putting out Sigil 2 - aka episode 6 - for free

25 years on, John Romero announces a new episode of the original Doom

SIGIL — Romero

SIGIL II Review - Against Thee Wickedly (PC) - KeenGamer

DOOM Turns 30, John Romero Releases SIGIL II

John Romero's SIGIL 2 dev: E6M6 Part 1

Unofficial Sixth 'Doom' Episode 'SIGIL II' Now Available for Free From John Romero - Bloody Disgusting

Doom (1993 video game) - Wikipedia

Sigil (mod) - Wikipedia

DOOM Turns 30, John Romero Releases SIGIL II

Sigil - IGN

John Romero's SIGIL II Now Available as a Free Add-On in 'DOOM' and 'DOOM II' To Celebrate DOOM's 30th Anniversary – TouchArcade

Unofficial Sixth 'Doom' Episode 'Sigil II' Now Available for Free From John Romero - IMDb