When the level starts, you will see a grid of blue dots. Then some of the dots will turn yellow for 2 seconds. Your job is to click the dots that turned yellow. If you clicked one that did not turn yellow, it will turn red. When you make 15 mistakes, you lose.
My best score is 558 Note: The game breaks when the square of circles is 18x18. (good thing is, i don't think anyone will ever get that far)