JacadoLight is a game in which you should press a key in order to turn the lights on and off. You are presented with a board of 5 x 5 squares. Clicking a square will toggle its light on and off (as well as the lights of all horizontally and vertically adjacent squares). The objective of the game is to turn all 25 lights on. Use the Navigation keys to move up, down, left and right; press any other key to turn lights on or off.