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Just for fun app. Consider a night city. Some windows are lit, some are dark. Due to a construction feature, it is not possible to switch light in a single window as the switches turn light in all its neibours, too. Help the inhabitants to get light On in all their windows, bring people harmony! Or send them all to bed...That's not that easy, but possible. Do not give up easily! You can develop your own algorithm. At least use Magic and follow it to solve the puzzle, this is a pure relax in this case. - Universal for iPhone and iPad;- 4 levels of difficultness for iPad and 3 levels for iPhone;- Fun animated reward when the puzzle has been solved; - Professionally recorded energetic background music; - Great for logic and algorithmic thinking development, for entertainment; - Highly relaxing;- Great as a gift app. ***************************About this app...The algorith of solving the puzzle was developed several years ago by a school boy in his school year maths project.