How do you play halo 4 with two people when you have the disc?

To play Halo 4 with two people using a single disc, you'll need two controllers connected to the same Xbox console. Start the game and select "Local" or "Split-Screen" mode from the main menu. One player can sign in with their profile or play as a guest, and then you can choose the game mode you want to play together. Enjoy your gaming session!