LightsOut is a version of the classic light-extinguishing puzzle Lights Out. The goal is, as hinted by the name, to turn off all lights on the game board. Pressing a light causes it and its four neighbors to toggle on and off. Lights that were off will turn on, and lights that were on turn off. Despite the simple rules and goal, games take most players several minutes to complete.

http://wiibrew.org/wiki/LightsOut