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The game "lights" consists of a 5 by 5 grid of lights; when the game starts, all lights are switched off. Pressing one of the lights will toggle it and the four lights adjacent to it on and off. (Diagonal neighbours are not affected.) The game provides a puzzle: to switch all the lights off.
Example of Droidfoot (Greenfoot for Android): http://www.programmierkurs-java.de/droidfoot
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