What is this game called?

There was a computer game I used to play a few years back, on Facebook I believe. You would start out with a colored ball and the goal was to eliminate all of the blocks of the same color. You could change the color of the ball by hitting a color changer. In the higher levels there were colored keys and locks as well. It was sort of a strategy game because a lot of times you had to figure out what order to eliminate things so that you didn't use all of the color changers before you finished the level. I hope someone remembers it. Thanks.