Doom: Sigil

After killing the Spidermastermind at the end of E4M8 (Unto the Cruel), your next tour of duty is eliminating the hellspawn that is causing unimaginable carnage in Earth's cities. But Baphomet glitched the final teleporter with his hidden sigil whose eldritch power brings you back 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!

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 SIGIL Megawad is the spiritual successor to the fourth episode of DOOM®, and picks up where the original left off.