It took its sweet time, but at least John Romero’s SIGIL arrived sooner than what happened with Daikatana. Romero’s “unofficial spiritual successor” to the fourth episode of Ultimate DOOM is now available to download for free, after the limited physical editions from Limited Run Games finally made their way out to those lucky fans who managed to snag them.

SIGIL comprises nine new levels for the original DOOM, with each containing “more detail” than the levels in episodes 1-4. Romero says the levels should feel like they “belong in the original game as if they were a true fifth episode”. They’re playable in singleplayer, co-op and deathmatch.

The story directly follows Episode 4, with Earth now overrun with demons, and it’s your job to teleport to Hell and confront the Satanic source of it all before returning to Earth.

The Megawad is completely free (if you don’t mind a MIDI soundtrack), but you can also spend €6.66 (roughly $7.50/£6) on a version with a metal soundtrack from guitarist Buckethead (which is available on Romero Games). You’ll also require the full version of Ultimate DOOM in order to play it (which you can easily snag on Steam or GOG.com).