E1M4 (The Apocalypse Project)

E1M4 is the fourth map of The Apocalypse Project. It was designed by Daniel Hornbaker.

Secrets

 * 1) After going through the arch east of the yellow key, staying towards the north side drops you down to an area with some imps and some health bonuses. There is a secret door in the north-east here (marked with a greenish texture) leading to a box of rockets and three zombiemen, and also allowing access to three areas that overlook the blue key area. (sector 507)

Current records
The records for the map at the Doom Speed Demo Archive are:

Things
This level contains the following numbers of things per skill level: