Press the flag to scramble up the square. Click on an individual square to change its color. Be careful, as when you change a color, you can change another square's color adjacent to it. This is definitely solvable, as I've seen someone solve this, although I have no idea how he did it. GOOD LUCK!
NOTE: There may be 6 ways that you can solve this, you can make them all red, orange, yellow, green, blue, or white, so try all of them in case just one works.