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

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

Steam :: Rock, Paper, Shotgun :: John Romero marks Doom's 30th birthday by putting out Sigil 2 - aka episode 6 - for free

John Romero Is Still Working On Yet Another Unofficial Doom Episode - GameSpot

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SIGIL - Unofficial 5th Episode for Original DOOM by John Romero, [H]ard

Doom (1993 video game) - Wikipedia

SIGIL II: John Romero's New DOOM 30th Anniversary Episode [UPDATED]

Nods to Mods Interviews SIGIL's John Romero

SIGIL - Unofficial 5th Episode for Original DOOM by John Romero, [H]ard

John Romero will release a new Doom episode, Sigil II, on December 10 for its 30th birthday - Neowin

John Romero Confirms He's Making a Sigil Sequel For DOOM 2 - IGN

John Romero takes you back to hell with new Sigil II Doom mod, pre-orders open at €6.66

DOOM Turns 30, John Romero Releases SIGIL II