Inferno

Inferno is the third episode in Doom/The Ultimate Doom. All of the levels in this episode are credited to Sandy Petersen, though Tom Hall originally began two of them.

This episode is set in Hell, possibly the inner region of Hell. The episode is named after Inferno, part of Dante Alighieri's Divine Comedy. The name of the final level is also a reference, as Dante describes Dis as a city encompassing the four lowest levels of Hell.

Most of these levels have a main, center room that can be easily identified, usually circular or square in shape.

Story
Having defeated the Cyberdemon who lorded over the lost Deimos moon base, the Doom marine learns that the moon has somehow been teleported right above Hell itself and, as such, was used as the gateway enabling the demons' invasion of the Martian facilities. Determined to press on and learn the true source of the invasion, the marine must fight through the twisted reality of perdition itself. As on Deimos, the environment itself is deadly - volcanic plains, jagged rock, and barren scorching wastelands sprawl before him, punctuated only by looming, decrepit labyrinths dedicated to the worship of evil and the torment of the damned.

Eventually reaching the heart of Hell itself, its capital city of Dis, the marine confronts the mechanized abomination which masterminded the invasion plot, the Spiderdemon. Using his newly discovered BFG9000, he leaves the creature nothing more than a charred wreck of tangled metal and splattered brain matter. A portal opens, revealing the green fields of Earth. Overjoyed, the marine steps through to return home, only to find that everything is not as it should be...

Levels

 * E3M1: Hell Keep (Petersen)
 * E3M2: Slough of Despair (Petersen)
 * E3M3: Pandemonium (Petersen and Hall)
 * E3M4: House of Pain (Petersen)
 * E3M5: Unholy Cathedral (Petersen)
 * E3M6: Mt. Erebus (Petersen; exit to secret level)
 * E3M7: Limbo (Petersen and Hall)
 * E3M8: Dis (Petersen; Spiderdemon is the boss)
 * E3M9: Warrens (Petersen; secret level)

End of Episode Message
The loathsome Spiderdemon that masterminded the invasion of the moon bases and caused so much death has had its ass kicked for all time.

A hidden doorway opens and you enter. You've proven too tough for Hell to contain, and now Hell at last plays fair -- for you emerge from the door to see the green fields of Earth! Home at last.

You wonder what's been happening on Earth while you were battling evil unleashed. It's good that no hellspawn could have come through that door with you...

Current records
The Compet-N records for the episode are: