Hey guys, if someone is desperate enough to do this, you can use hex editors like CheatEngine on the PCin order to propel yourselves up on the high score list. I have tested this, and you can change the value of your points (or anything with numerical value for that matter) on solo or, if you are the host, on multiplayer zombies. In solo it works best, and remember even on solo there is a leaderboard.

Be warned, however, because although it has never happened to me, you MAY be liable to banning. It is a very easy way to explore the maps, however, and my experience using this "strategy" has helped me at least know the map better in order to play the game better WITHOUT cheating.