Episodes, keys and the route through Doom
Understand the three original episodes and navigate without losing your bearings.
Original 1993 PC Doom campaign: Knee-Deep in the Dead, The Shores of Hell and Inferno. Shareware includes only the first episode. Ultimate Doom’s fourth episode, Doom II weapons and monsters, and modern port enhancements are outside this hub.
The three-episode route
Knee-Deep in the Dead uses the Phobos installations, The Shores of Hell moves to corrupted Deimos facilities, and Inferno takes the route into Hell. Each episode has its own beginning and end. This guide covers the original campaign; Thy Flesh Consumed is the additional fourth episode introduced by Ultimate Doom.
Remember locked doors and switches
Blue, yellow and red keys open corresponding locks. Note a locked door when first passing it, then return after finding the key. A switch may affect another room, so watch and listen for the result before moving on. Use a simple mental route through cleared areas rather than searching every corridor from scratch.
Use the automap as a working sketch
The automap helps you compare connected corridors and locate unexplored branches. Stop somewhere safe before inspecting it. Revisit an uncertain junction from a known room and choose one branch at a time. A map provides orientation, but enemies and hazards still require attention when you return to the action.
When stuck, return to a known landmark and trace one unexplored branch.
Picture details
Game artwork belongs to its respective rights holders.