Halo: The Master Chief Collection is developed by one of at least two internal teams at 343 Industries. The Master Chief Collection is free for Xbox Game Pass subscribers on PC and Xbox One. The remaining three entries in the PC collection are coming later, wrapping up with Halo 4. Halo 2 is the third game to be added to the PC version of the Master Chief Collection, following Halo: Reach and the original Combat Evolved. 343 is also warning that bullet registration is 'not in parity' with the original game, while the visual effects on snow 'do not match legacy behavior.' Additionally, and this one sounds like a big deal-'the sun is not rendering on most maps and missions.' You can see the full known issues below, as posted on 343's website.