Can you spot the difference? Try to match the displayed colors - the better you are, the more points you collect!
Drag the outer circle so that the colors in the center match. Let go to confirm. Try to gain as many points as possible within the 30 second time limit. In the hard mode, you’ll only get points for near-perfect matches, and you’ll lose points for bad matches! To be able to afford powerups (to extend the countdown or skip a difficult color), play a few rounds to collect enough points.