Reality Engine

The Reality Engine, also known as RAGE for "Reality Advanced Gaming Engine", is a custom engine written by Randal Linden and used for the Super NES port of Doom. Since the game was ported without having the Doom source code as a reference, it has many differences in how the engine internals work.

Easter Egg
Within the ROM itself, a hidden message can be found which reads, "Rage / Reality Engine written by Randy Linden. Special thanks to my loving wife, Jodi Harvey." It can only be found if the ROM file is opened in a hex editor, and is found at position 10F (271 in decimal) and address.