Halo: Master Chief Collection update adds new Flood Firefight mode

343 Industries is updating Halo: The Master Chief Collection with new content and cross-play for Halo 3 and ODST.

Halo: The Master Chief Collection Update Adds Flood to Firefight and More

Halo 3 ODST, FLOOD FIREFIGHT, PC

Firefight - Halopedia, the Halo wiki

Halo MCC update brings Flood Firefight and Halo 3 crossplay

Halo: MCC Season 6 now available with a new Halo 3 map, unlocks, and more - Neowin

Looks like Flood Firefight is coming to Halo MCC this week

Halo: The Master Chief Collection is bringing the Flood to Firefight

Halo: MCC update brings Flood-infested Firefight

Halo MCC Just Got A Huge New Update! (Flood Firefight, New Skulls & More)

Flood (Halo) - Wikipedia