Level 13 is bugged. When I colour an area, just a couple of pixels are stucked behind 2 areas and they will not change colour, i.e. there is a blue area, it became yellow and a couple of pixels get stucked. The I change the yellow area in purple but the 2 pixels still remain yellow, so I need one more click to win, even if I have already won. But iI can't 6/4