Get a shooter, and play the game on the easiest mode with the controller upside down, and see how long you live.
Every 30 seconds: 1pt
Every 1 minute: 5pts
Every 2 minutes: 10pts
And then it keeps doubling with each thing (E.G.: Every 4min = 20pts, Every 8min = 40pts)
For example, if you lived 5 minutes, you'd get 55 points.
Good luck! 
Edit: NO COVER AND/OR CAMPING ALLOWED!!!!!!!!!!!!!!!!!







