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

343 Industries discusses whether or not it would be possible for the original Halo or Halo 2 to get an update that adds 4-player co-op.

A Halo Infinite update on seasonal, co-op and Forge plans has been delayed

Halo 6 Confirmed to Be in Development by 343 Industries

Halo Infinite coop campaign mode pushed for Battle Pass Season 3

Halo 4 - Wikipedia

Review: Halo 5: Guardians - Slant Magazine

Halo Infinite Players Find A Way To Glitch Into Campaign Co-Op

Why Players want Playable Elites in Halo Infinite

Halo Infinite's cancelled split-screen campaign co-op tested - and it's excellent

343 Industries Breaks Promise To Always Implement Split-Screen Co-Op In ' Halo' Games, Unceremoniously Removes Feature From 'Halo Infinite' - Bounding Into Comics

Halo Infinite – Campaign Network Co-Op Preview