This game is entirely controlled by touching the screen or clicking with the left mouse button. To begin the game, touch the arrow in the lower-left corner.

The objective of each level is to turn off all of the illuminated lights. Touching a light toggles the currently selected colour state of both that light and also its nearest neighbours. The colour that is toggled can be selected with the icons labeled 'R', 'G' and 'B' on the right.

You will be rewarded with additional time upon completion of a level. If you get stuck, click the lower-right icon to either restart the level or generate a new random level.