The old-school arcade games were light on plot compared to the home console games of today.
Mostly, as you progressed in a game, the bad guys did the same basic thing, but faster or more. There were more bullets, more aliens, or the ghosts were more bloodthirsty. The blocks fell at an unmanageable pace.
This is a convenient way to make the most of the available RAM. It's also not so different from real life. We do tend to confront the same problems and challenges over and over, but at a higher difficulty setting each time.
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