"You shoot bullets at the enemies to make their health number go down, so you can chip at your arbitrary number of objectives, and find gear to improve your numbers in rooms with very large numbers of chest-high walls... Some day they're going to refine this all down and make a game where all you do is press plus-one on a calculator until you reach the arbitrary point that makes a nearby person's chest cavity explode, and your calculator gets slightly bigger. It'll make billions."