Find the darkest cell and type '1' inside it. Find the next darkest cell and type '2': keep going all the way to 100, starting with black, passing by blue and ending with white
Great concept, although with the size of each square, having to scroll up and down presented an extra challenge. I guess 50 Shades of Grey is coming next...
I don't have to scroll on mine, guess it depends on everyone's settings. Maybe you can zoom out to make it fit? Grey has been done already (with 25 shades), Quizzer was planning to make 50 shades of grey actually!