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Light Up

Place light bulbs in the grid so that every white square is illuminated. Light bulbs illuminate all squares they can see horizontally and vertically. They are blocked by black squares. Light bulbs are not allowed to see each other. Number clues in black squares tell you how many light bulbs there are in the 4 squares touching it. More information.
valvino, June 18, 2013

There are 81 Light Up puzzles.
 
  
   

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