en IGN he visto esto:
Halo on the Nintendo DS? It could have been, if the deals had worked out. A major publisher began negociations with license holder Microsoft for the game to happen, and contracted a known game developer to produced a spec demo of a version of Halo for the Nintendo DS. The demo was made, the game was (according to those who played it) appropriately accurate to the Halo experience on Nintendo's little handheld, and the talks were active in making the game happen ... and then, it was no more. Due to issues regarding the license, Halo DS was never fully produced.
A similar situation with the Halo franchise had occurred years earlier with the Game Boy Advance platform, but whether a demo or game code for GBA was ever produced is not known.
bueno habra que seguir soñando xD