Players need to use the principle of fusion and ablation of the three primary colors to throw a primary color ball through the black hole to change it into the target color.You can earn points by eliminating them after you hit them. You need to observe the color of your target ball, adjust the shooting angle and long press the "press" button to throw the ball. As the ball passes through the black hole, the color will merge with the black hole. The black hole changes color every three seconds, so you need to find the right time.