Solve this LightsOutPuzzle!
The playing board is a 5x5 grid of lights. A light is either on or off. When you click on a light, the on/off state of that light---as well as the lights above, below, to the left, and to the right of it---toggle. The goal of the puzzle is to turn all of the lights off.
(For those who feel like this is too difficult, there's a pretty easy way to solve it)