Diddl released a modified port of Doom for the Nintendo DS.

Changes:

# small menu to choose between wad type (doom1, doom2, tnt, plutonium)
# change standard path dependent on wad type for wad files and save files. (/dsdoom/doom; /dsdoom/doom2; /dsdoom/tnt; /dsdoom/plutoinium)

http://forum.gbadev.org/viewtopic.php?t=13802