Doom (1993 video game)
Doom (typeset as DOOM in official documents and stylized as DooM in other media) is a 1993 first-person shooter (FPS) video game by id Software. It is considered one of the most significant and influential titles in video game history, for having helped to pioneer the now-ubiquitous first-person shooter. The original game was divided into three nine-level episodes and was distributed via shareware and mail order. The Ultimate Doom, an updated release of the original game featuring a fourth episode, was released in 1995 and sold at retail.
List of Doom source ports
Chocolate Doom is a source port for Windows, Linux, macOS, AmigaOS 4, MorphOS, and other modern operating systems that is designed to behave as closely as possible to the original DOS executable ("Vanilla Doom"), going as far as to duplicate bugs found in the DOS executable, even bugs that make the game crash. This involves more than just leaving the bugs in the source code. Several bugs present in the DOS version (for example, the sky bug in "") were fixed in the released "Doom" source code, so these bugs were re-created for Chocolate Doom. The first version of Chocolate Doom was released on September 7, 2005. As it is designed to be as close as possible to the DOS executable, it has no new features and lacks high resolution support. It supports OPL3 music emulation, as well as the standard MIDI output on its host operating system. It is a popular test engine for level designers, and among players who prefer unmodified Doom. By default, it simulates the behavior of doom.exe version 1.9 running under Windows 98, although it will simulate the executables from "The Ultimate Doom" or "Final Doom" if it detects their respective IWADs. The latest version of Chocolate Doom, version 3.0.0, was released on December 30, 2017.