E3M8: Jovian Déjà Vu Again (The Lost Episodes of Doom)

E3M8: Jovian Déjà Vu Again is the final map of Hell's Gate - The Red Spot of Jupiter in The Lost Episodes of Doom, which features a boss battle with the Spider Mastermind. It was designed by Bob Carter.

Walkthrough

 * Letters in italics refer to marked spots on the map. Sector numbers in boldface are secrets which count toward the end-of-level tally.

Essentials
This level is almost identical to E1M1: UAC Spaceport. The main difference is in the pit with the rising floor where the Shotgun used to be. It contains the Spider Mastermind, which serves as the games final boss. Killing the spider also finishes the level, so keys are no longer essential for its completion. To get 100% completion however, one must drop down to the pit and survive the trip with the menacing spider to the top without killing him (which is the only way to get past him). Luckily, there is an invulnerability sphere in secret #1 (instead of the yellow key). Other differences are in pickups (icluding ones within secrets), notably the energy cell packs and the small room where the exit used to be is changed.