How does quadrant actually work?
    
    
    
      The game starts out "relatively easy" and then get punishingly difficult.
    
    
      There are four possible positions of the big square:
    
      Upper left - upper right - lower left - lower right
    
    
    
      According to the position, you will have to press one of the four buttons:
    
    
      - If you press a correct button, the score increases by one.
    
      - If the button is wrong your score will be set back to zero!
    
    
      - If you don't push a button at all, your score will stay the same,
    
      but the squares will slowly turn invisible and then cause a "game over".
    
    
    
    
        What about the small square then?
    
    
    
      The small square indicates the next position of the big one, and is a huge help.
    
    
      At certain stages, it will be close to impossible to beat the game without paying attention to the small square...