IGN on X: "“In order to improve and accelerate ongoing live service development... we have reallocated studio resources and are no longer working on local campaign split-screen co-op,” - Halo Infinite developer
Halo Infinite Forge Mode Gets November Release Date, But Split-Screen Co-op Cancelled
Halo Infinite Online And Split-Screen Campaign Co-Op Delayed - Game Informer
Halo Infinite Co-Op Campaign Is Now Playable With A Glitch, But Beware - GameSpot
Halo Infinite players find a way to add split-screen co-op | Eurogamer.net
Halo Infinite's Campaign Would Feel Weird In Couch Co-op
Halo Infinite Adding New Achievements for Campaign Co-Op and Mission Replays