Considering that their game is the most-played game on Live, it seems a bit strange that Call of Duty 4 would be taking cues from its defeated opponent. Yet to celebrate the release of the Variety Map pack, Infinity Ward is doing just that, taking a leaf out of Bungie's book and creating their very own version of the Double EXP Weekend. The COD4 weekend is a bit different than the Halo 3 system however. In Halo 3 the boosted EXP is limited to a specific playlist: Grifball. In Hal- er, we mean COD4, the EXP is doubled any time a match is played on the Variety DLC maps. So while you're effectively paying for the new EXP, it is good to see Infinity Ward taking preemptive steps to match anything that could lead to Halo 3 coming back to the top. Competition breeds excellence right?