Legendary game maker John Romero has announced Sigil, "an unofficial spiritual successor to The Ultimate Doom's fourth episode".
The announcement comes 25 years on from 10th December 1993 - the day the original Doom launched. That's a quarter of a century ago! Just to make you feel old.
Sigil contains nine single-player and nine deathmatch levels, and will be released for free in mid-February 2019. As a megawad, you'll need the original Doom (not the remake) to play it.