DSDoom is a port of Doom to the Nintendo DS based off the Prboom source tree because of its purity and portability.

dsdoom is a game engine - it provides a program to play Doom levels, but it doesn’t include any levels itself. So to play dsdoom, you need one of the main Doom date files from id Software - either doom.wad, doom2.wad, tnt.wad or plutonia.wad from one of the commercial Doom games, or the shareware doom1.wad. This file is called the IWAD.