Llumeta restless is a game of reflexes.
The only thing to do is to press the button (Space or Enter key) or the screen at the exact moment that the light in the white box with the arrow is on.
If you succeed, you can go to the next step. There are 8 in total.
On each screen the speed of the light is increased a little.
At the beginning you can choose the initial speed of the light.