It’s hard to believe that Halo was originally not going to be exclusively released for Xbox. Halo was originally supposed to be released on Mac, PS2, and Dreamcast, before good ol’ Microsoft bough 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. The Dreamcast had a quick start, but was fading fast, but some PC game ports were still being released for the system. A version of Quake III Arena had been released but as sales of the Dreamcast console dwindled, a Half-Life port was cancelled and Halo was right behind it.
If Halo had been finished in 2000, it just might have happened. Might have even had online capability with the Dreamcast’s mighty 33.6kbs dial-up modem! Here are some lost photos of what the game originally looked like.