Protect the Balls!

You must protect the world from the Black Ball of Wrath by tapping on the other balls.
Once a ball (other than the Black Ball of Wrath) is tapped, you cover it with a shield which protects it from any collision with the Black Ball of Wrath. However, since you are not Gaben and thus your power is limited, you can only protect 2 BALLS AT A TIME.
To shield a third ball, you must first deactivate 1 of the 2 already activated shields.
If a collision occurs between a Black Ball of Wrath and another ball, and the ball is not protected, your game is over.
Soon you shall realize that the real challenge lies in swiftly deactivating one shield and activating another.
Try predicting the collisions of the balls with each other and the walls beforehand to achieve a higher score.
The score depends on how many possible disasters you avoid by protecting the balls.
Have fun!

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