By digging through the source data of the multiplayer beta, the modding community has been able to unlock a massive list of on-screen text for both Halo 3's multiplayer and single-player campaign.

One fragment of text modders unearthed was this bombshell:

"The game cannot start because all players are set to observer. Too many players for split screen. Only 2 players may play split screen coop on the same Xbox 360 console. The party size is too large to start the game. Up to 4 players may play coop on Xbox Live or System Link. Loading information from Xbox Live...