The Halo 3 Double EXP Weekends continue on (in spite of whatever day the calender insists it is) with the very latest playlist addition: Grifball. The Grav Hammer based fan-favorite gametype is firmly grounded in Foundry and is loosely based on soccer. For those who are arriving late to the Grifball party, the game is very simple: get the ball in the goal without dying. But you'll have to try to get your playing in before 2am Monday morning, as that's when the "Double EXP Weekend" ends. The Grifball playlist is live now.