Pizza Hut is giving away the virtual items.
Microsoft has teamed up with Pizza Hut to launch a Halo 4 Legendary Prizes competition, offering contestants the opportunity to win limited edition Halo 4 Xbox consoles, Halo 4 Xbox games, and Halo 4 headsets.
Furthermore, a separate give-away is offering everyone who enters their details a free Halo 4 Avatar outfit. You need to be residing in the UK and aged 16 or over.
The competition ends December 30, 2012.
Halo 4 will be released November 6.