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Group of things to kill. Kill them. We advance. Get new group of things to kill. We kill, we advance to next group of things to kill.
Now we have pretty backgrounds, maps, worlds, stars and moons, fire, and trees.
You pass all the tests in first grade, you get to go to second grade, then to third.
I start my job cleaning the floor, then get promoted to fry-station, then cashier, then cook. Now I have a badge that says 'crew chief'.
Is this the only way to go?