343 Industries is upgrading the Halo 3: ODST campaign and giving it away for free, alongside other gifts, if you played Halo: The Master Chief Collection between its launch date and today. The news was announced in a blog post, "A Thank You to Our Fans from Bonnie Ross," written by the studio head at 343. "This has been a humbling experience and highlighted how we as a studio can – and need – to do better for Xbox fans around the world.