Sigil

The Sigil Megawad is free download created by John Romero for the original 1993 Doom. It contains nine single-player and nine deathmatch levels. The free megawad will be released in mid- May 2019 and requires players own the original 1993 registered version of Doom in order to play. The SIGIL Megawad is the spiritual successor to the fourth episode of Doom, and picks up where the original left off.

After killing the Spiderdemon at the end of E4M8 (Unto the Cruel), your next stop is Earth — you must save it from hellspawn that is causing unimaginable carnage. But Baphomet glitched the final teleporter with his hidden sigil whose eldritch power brings you to even darker shores of Hell. You fight through this stygian pocket of evil to confront the ultimate harbingers of Satan, then finally return to become Earth’s savior. In summary, rip and tear!