SDL Doom or SDLDoom is an old and simple port of Doom, made by Sam Lantinga in the year 1998. As its name states, it uses the Simple DirectMedia Library for the drawing functions. SDL Doom is programmed in the C language and is open source. It was the basis of the first Symbian OS Doom port, CDoom and later the C2Doom project. It doesn't support custom WAD files. Only DOOM1.WAD, DOOM.WAD, DOOM2.WAD, DOOMU.WAD, PLUTONIA.WAD and TNT.WAD are supported.