

In the Atari Jaguar, Sega 32X, 3DO, and Game Boy Advance versions of the game, only a single secret level exists, MAP24: Military Base, which is the analogue of the PC version of E1M9 and is reached via the same manner from MAP03: Toxin Refinery. The various console versions of Doom and Doom II contain a different admixture of secret levels, in some cases reached from different locations than in the PC version. Some source ports change this behavior to something more consistent: for instance in ZDoom the Doom II secret exits outside of MAP15 and MAP31 merely lead to the same level as the normal exit. If such a level is not available, the player will be warped to MAP01: this effect is created by the secret level information not having been initialized. If the player uses a secret exit outside of MAP15 or MAP31, the next level will be the one that was last entered via an intermission screen.

Depending on the specific episode and level this occurs on, the player may end up either skipping several maps, repeating the level they just left, or being sent back to an earlier level.įor example, MOUNTAIN.WAD reaches E3M9 from E3M5, and continues on to E3M7, skipping E3M6 entirely. However, upon completing it, the player will be taken to the level immediately following the one they were meant to access it from. If the player activates a secret exit elsewhere than in one of the four aforementioned levels, the player will go to the secret level as usual. The actions of the secret level linedef types have been hard-coded into the engine. E4M9: Fear, accessed from E4M2: Perfect Hatred.E3M9: Warrens, accessed from E3M6: Mt.E2M9: Fortress of Mystery, accessed from E2M5: Command Center.

E1M9: Military Base, accessed from E1M3: Toxin Refinery.
