Halo 5's 4-Player Co-Op Allows for a Much More Sociable Story - GameSpot

Microsoft explains why it's focusing so heavily on four-player co-op with the upcoming game.
A new entry in the Halo franchise was announced at the Microsoft Press Conference at E3 2013 for the Xbox One.

Halo 5: Guardians features exciting 4-player co-op and new enemies

Why was Halo 5 so different from the other Halo games, and then so badly received? - Quora

Xbox Head's Excuses For No 'Halo 5' Splitscreen Are Nonsense

Halo: Combat Evolved - Wikipedia

Halo: Reach - Wikipedia

Halo Infinite release date: The Master Chief returns to Xbox in late 2020

Halo 5: Guardians 4 Player Co-op Campaign Walkthrough Part 1 [1080P 60FPS]

Halo 5: Guardians, Halo University Wiki

343 Industries commits to developing 'future' Halo games despite layoffs

Halo 5: Guardians To Boast Four-Player Co-Op Blue Team Mode - SlashGear

Halo 4 Review - Giant Bomb : r/Games

Halo 5's campaign stars multiple Spartans, and one ODST, in both single- player and co-op - Polygon