There wasn't even a Halo game as a launch title, but there was backwards support for the original Xbox Halo games on the 360. https://en.wikipedia.org/wiki/Xbo

There wasn't even a Halo game as a launch title, but there was backwards support for the original Xbox Halo games on the 360. https://en.wikipedia.org/wiki/Xbox_360_launch#Titles https://en.wikipedia.org/wiki/Xbox_360_launch#Titles There wouldn't be a Halo game released for the Xbox 360 until September 2007, nearly two years after the release of the console.