343 Industries has said folks will be able to switch easily between Halo Anniversary and Reach thanks to both games using the same image.
Speaking with Alex Donaldsonfor VG247 at Microsoft’s Play Day event in Colonge, Anniversary's executive producer Dan Ayoub said the maps in the game will be exportable.
"We decided to use the Reach engine specifically for Halo Anniversary so people can play between games, so if you're on Reach and I'm on Anniversary we can play Multiplayer together," he said.
"If you've got Reach and you don't pick up Anniversary - and I don't know why you'd do that - you can get it as DLC. But if you've got Anniversary you're gonna be able to download it to your drive and that way if you've got the Reach disc in you can play the multiplayer on the Anniversary maps as well."
Halo: Combat Evolved Anniversary launches on November 15 on 360.