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Mercyhurst UniversityDept of Math and ITDr Williams Home

Lights Out




Moves: 0


About Lights Out

This applet is based on a game that has several variations. The version presented here is common, though more complicated editions exist (such as lights with more than two states). Given a random starting configuration, the goal is to find a sequence of "moves" that will turn all lights out (so all blocks are black). Pressing one light will change its state, as well as the state of its four nearest neighbors.

Not all starting configurations have solutions. This applet provides several choices for starting configurations - not all of them have solutions.

A special thank you goes out to all Math 150 students in Spring 2016 for their puzzle contributions!

Using the Applet

Tap a square to flip its "switch" along with its nearest neighbors. The puzzle is complete when all squares are black.

About this Applet

This applet was created using JavaScript and the Raphael library. If you are unable to see the applet, make sure you have JavaScript enabled in your browser. This applet may not be supported by older browsers.