Gearbox's creative focus is on the multiplayer, and the developer plans to include new maps, and may also add weapons and vehicles. It makes sense to design new maps considering that the PC game will more often be played with larger numbers of players in a server. It's likely to support 32 players per server. Pitchford mused that it might be possible to release a mod pack that would allow fans to create new levels for Halo, but said it's too early to tell. For various reasons, it's unlikely that PC and Xbox players will ever face each other in the game.

The PC version will feature a faithful port of Halo's acclaimed story-based campaign that won't be changed in any substantive way. However, conventional mouse and keyboard controls give PC players an advantage that would make the game too easy if the difficulty settings weren't rebalanced somewhat. Pitchford mentioned that the harder settings might need the most tweaking, since the legendary difficulty should still be terrifically hard. Bungie is working closely with Gearbox and has provided some insight on how to maintain the game's balance.