The Ultimate Doom

Ultimate Doom is an upgraded version of Doom released on April 30, 1995, adding the fourth episode Thy Flesh Consumed. The following changes were also made to the game:


 * the addition of a few passages in E1M1: Hangar
 * a secret switch in E1M8: Phobos Anomaly
 * sector type 37 from Doom II
 * several new linedef actions, including fast raising doors and keycard switches
 * the behaviour of A_BossDeath was altered, breaking the PWAD Doomsday of UAC

The level changes were added to allow for a more interconnected deathmatch play.