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Call of Duty 4 is one of the best-selling Steam games right now, but only because you need it to play an ambitious Modern Warfare 2 multiplayer mod launching this week
There's a Call of Duty climbing the top sellers list on Steam right now, and it's not Black Ops 6. It's Call of Duty: Modern Warfare Remastered, the 2016 re-release of 2007's Call of Duty 4.