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...