In the Dark  
Brain Warmup 
Problem:  
Light up all the squares in the two grids, below. If you can only solve the 4x4 puzzle then go ahead and submit your answer anyway. You can always submit the 5x5 later. This puzzle requires JavaScript to be enabled on your browser. 

Solvers:  


Solution:  
The first thing to note about this problem is that that order of your clicks
does not make any difference. In fact, clicking on a location twice is a
complete waste of time because it just undoes any changes made to the board
the first time you clicked. Thus, the solution can be represented as the
locations that have been clicked an odd number of times. This is how my
javascript worked and it is how I will display the answers.
4x4: There are many ways to solve the 4x4 block (16 not counting rotations). The fastest method requires only 4 clicks. 5x5: There is only one way to solve the 5x5 block (again not counting rotations).


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