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All-Lights Puzzle

Author: Yasunari Hiramatsu

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Turning the 25 lights of table On

The objective of the game is to turn all 25 "lights" on. Clicking a square will toggle its light (as well as the lights of all horizontally and vertically adjacent squares) on and off....

With just 15 clicks you can accomplish it.


You need a Java-enabled browser to use this applet.


If after several attempts (RESTART) you fail to illuminate the whole chequered board, you will find one of the four possible solutions found by Luis Silvestre, a student of Computer Science and Mathematics at UNLP here.



[Answer Nº 4]



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