Board Thread:General Discussion/@comment-24655203-20140308000000/@comment-13892511-20140513154709

Or maybe play lots of multiplayer. I used to gain about 25,000 in 1-2 days, but I seriously used to play for more than 10 hours. I also you need to be able to get lots of kills and captured flags, to gain that much. I personally never really liked single player.