The original Halo: Combat Evolved (2001) does not run natively on Xbox 360. Here are your actual paths:
Microsoft's 360 BC program covered ~600 titles. Halo CE was excluded (likely to drive Anniversary sales). Halo 2 is BC on 360, but it's the Vista port with issues.
| Platform | Best Option | Cost |
|---|---|---|
| Xbox 360 only | Halo CE Anniversary (disc) | $10-20 used |
| Xbox One / Series X|S | MCC (Game Pass / $40) | Best experience |
| PC | MCC on Steam | $20-40 / Game Pass PC |
Don't waste time on 360 BC hacks—they don't exist for Halo CE.