I've never really mastered any of the classic arcade games, but based on console versions that I have mastered, I've always assumed that to break a game (short of a cheat) you've got to find it's weakness. That weakness might be a pattern that can be memorized (or be well characterized), a "trick" or style of playing that isn't obvious but simplifies gameplay, or some scoring technique that proliferates lives excessively. I suppose becoming "one with the machine" is another method--but I've always assumed that was cheating.