The Halo 3: ODST campaign for Halo: The Master Chief Collection has finally been released by 343 Industries as redemption codes have started to flood the inbox of Xbox One owners.

The redemption codes for Halo 3: ODST appears to be going out to those who attempted to play The Master Chief Collection anywhere between its November 11 launch and December 19. 343 announced late last year anyone who attempted to play its game within those dates would receive a free copy of Halo 3: ODST when it releases.

The Halo 3: ODST update adds the original’s main campaign, all of which is running at 1080p and 60fps. Unfortunately, its co-op Firefight game mode is not included. Those who are not eligible to receive a free redeemable code from Microsoft for Halo 3: ODST will need to wait until the campaign is officially listed on the Xbox Store, which is priced at $4.99.

343 has also released a re-imagined version of the popular Halo 2 multiplayer map Relic, called Remnant. It's available as part of a free game content upgrade, and is described as a secluded island, hidden along the coastal regions of Delta Halo. It features an asymmetric layout with the artifact's elevated position making it an ideal map for Slayer, Assault, and 1-Flag CTF game types.

Today’s news comes just a few days after 343 claimed the May 29 release date leak on Xbox.com was made in error as it was supposed to serve as a placeholder. We find it to be rather strange to release such a big add-on like ODST to The Master Chief Collection on a Saturday, but who are we to complain? At least 343 is staying true to its promise of giving away codes for ODST after The Master Chief Collection’s terrible launch.