The new (and weekend limited) Halo 3 Team Snipers double EXP matchmaking playlist is live right now, will end sometime during the early morning hours this Monday and requires both the Heroic and Legendary Map packs. Secondary requirements for enjoying Team Snipers is a steady hand, a talent for shooting people's heads and we're sure a previous preference for the sniper rifle would help too. Have fun, rack up the EXP and earn that General Grade 3 already.
