The game is very simple: at the center of the screen there is one circle divided in two, each half-circle has a different colour. When the game starts, many balls will come onto the screen, each with some random colour. The balls will collide with the circle at the center because it cannot move but only rotate when you tap the screen. Your goal is to survive the most by matching the colors of the balls and of the cirlce at the center. If the colors mismatch you lose! Simple and addictive!