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The original Doom levels are based on the Jaguar version, and therefore, as with all ports based on this version, the simplifications to the map geometry and texturing versus the PC version are carried over. The maps from Ultimate Doom's Episode 4 and Doom II contain similar, although less changes. Overall, this means that the number of unique textures per map is lower than in the PC version. Further examples of simplifications would be the omission of [[crusher|crushers]] in Ultimate Doom and the reduction of large vertical heights. These changes are done mainly for performance reasons; however, there is still noticeable slowdown in certain levels, particularly when playing on the higher difficulty settings.
Uniquely to the PSX and Saturn ports, monsters from Doom II appear in Ultimate Doom levels, but only when the game is played on "Ultra Violence". Also, [[megasphere]]s can be found in the PSX/Saturn exclusive Ultimate Doom levels [[MAP29: Twilight Descends (PlayStation Doom)|MAP29: Twilight Descends]], [[MAP30: Threshold of Pain (PlayStation Doom)|MAP30: Threshold of Pain]] and [[MAP57: The Marshes (PlayStation Doom)|MAP57: The Marshes]], with the latter additionally featuring a [[super shotgun]]. A tougher type of [[spectre]], the [[nightmare spectre]], has been added. While the regular spectre looks like a partially invisible [[demon]], the nightmare spectre is subtractively blended, and is harder to kill due to having twice the hit points of an ordinary spectre.
==Enemies==
The game features fewer enemies compared to the PC version:
*The [[final boss]] from Doom II is not in the game, and the final level "Redemption Denied" instead contains one or two spiderdemons, depending on the [[skill level]].
*As the corresponding secret maps are missing, the game lacks the [[Wolfenstein SS]] and [[Commander Keen]] enemies.
==Levels==