The Doomsday Engine is a port of the one created by id Software for the video game Doom. It was later used for the Doom sequels and even by other studios like Raven Software for Heretic and Hexen. These games are not currently supported on the Windows OS, which makes this tool essential for playing them, with the added bonus that it provides some extra features. To use Doomsday Engine, you need the original files for the game you want to play, specifically the files with the WAD extension. If you don't have the original game, you can always use the shareware versions that include plenty of maps. In fact, there are tons of variants of the original games that completely change the graphics, music, and settings, and can be found for free online. The engine greatly increases the game's resolution while preserving the original sprites and textures. The filters applied, along with the new lighting and shadow effects, hugely improve upon the original experience while adding some extra characteristics like the ability to aim in any direction with the mouse, plus an integrated system for playing online.
