Halo was originally not going to be exclusively released for Xbox. Halo was originally supposed to be released on Mac, PS2, and Dreamcast, before Microsoft bought 20% share of Bungie. The game was developed by Bungie but was going to be produced by Rockstar at the time. The game started as a real-time strategy for the Apple Macintosh, but quickly changed to a first-person shooter and was to be cross platform. Just think maybe if it went though as planed maybe the Dreamcast wouldn’t have died off.