Since Partnernet, the development version of Xbox Live, was disabled for the Xbox 1, some users have been able to hack around some of the limitations for the Halo 2 Multiplayer Beta. Namely, Live support is no longer needed. I had first revealed footage of the game a number of years ago, close to 2007 I believe. The video is low quality when compared to this newly captured footage, which is natively 480p, so no nasty interlacing artifacts.
Featured in this video are removed weapons, a vehicle (the Mongoose!), health packs, and a different HUD. Like I said, this is a hacked version of the game, so a Mongoose would not normally be parked in the basement of lockout.