4-Player Co-op Glitch, Halo Alpha

The 4-Player Co-op Glitch in Halo 3 and Halo: Reach allows three or four players to play locally in Campaign or Firefight. Have two players sign in and proceed to the Campaign or Firefight lobby. While in a Campaign mission or a Firefight game, press A for the amount of players that are going to join. Quit the current mission/game. Start the game again, but this time press A for the third player a second after the final beep of the countdown. For 4 players, do the same, but press A for the fourt

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Alpha Pack was touted as a tent pole feature of Season 2 yet what we got is hardly even an event. This is unacceptable. : r/halo

Halo: The Master Chief Collection – 4 Player Co-op in Halo 1 and 2 “Is Further Down the List” of Priorities for 343 Industries

Walking in the Dawn, Halo Alpha

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Shutdown Halo Alpha+BreezeWiki

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343 Industries Addresses Whether 4 Player Co-Op is Possible for Halo

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PSA: You can still glitch into splitscreen co-op! : r/halo

Halo Infinite Co-op Campaign & Mission Replay Flighting Set for the week of July 15th in a long and detailed blog post - XboxEra