Host an online match on Xbox Live. It can be any match type, as long as you are the host.

After the game begins, press Start. Then hold LB and Left Analog-stick (2), press A, click Right Analog-stick (2), press B, click Left Analog-stick (2), press X, click Right Analog-stick (2), press Y.

The message "GiDoeJoe Mode" will appear on everyone's screen to confirm correct code entry.

Alpha team will shoot blue lasers and Bravo will shoot red lasers.