Halo fans can today get their hands on the Halo: Reach multiplayer Beta for the first time.
So long as you have a copy of Halo 3: ODST, you can get access to the Beta via Xbox Live in around four hours from now.
Bungie reckons the beta will attract three million players across the globe.
Halo: Reach will be the studio's last game before its all-new IP arrives, published by Activision.
Microsoft reckons that interest in the Beta - which ends on May 19 - will 'reinvigorate' sales of ODST this month.