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This one's crazy. :P
For level 23: make the bottom half black and the top half white. Then apply the funnily shaped instrument and paint your ball black, and then white. You may have to drag your ball over the hat first, but it doesn't show up. =O
 "The irRegularGame of Life"){kind=icon}
 "Factory Balls 2"){kind=icon}
 "GemCraft"){kind=icon}