Doom co-creator John Romero has crafted his first new Doom level in 21 years.

The veteran developer took to Twitter to release said stage in his DropBox.

Entitled Tech Gone Bad, Romero's new stage was designed for single-player, co-op and Deathmatch, the famed dev said in the accompanying text notes.

It's been 21 years since I made a DOOM level. Here's my version of E1M8 using DOOM1.WAD. https://t.co/ueKM7gBbXd pic.twitter.com/NlmA9aIALN — ???? ?????? (@romero) January 15, 2016

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He also referred to this new stage "a warm-up", which corroborates a statement he made a year-and-a-half ago about working on a new shooter.

Romero further added on Twitter that it took him "several hours over the last two weeks" to make this retro throwback to his best-known title. Here's the description of the new map in Romero's own words:

"After exiting the Computer Station you knew the worst was up ahead. You still hadn't reached the place where the demons were coming from. The steel door shuts behind you as you realise you're there; you're at the Phobos Anomaly. Cracks from hell are all over the place as seepage from the portal invades the entire installation. Now it's time to find the portal and stop the demons from coming through. You know UAC had hundreds of scientists working at a high-tech lab somewhere."