Juggling
The best way to juggle is to try and get the balls at equal height. This is difficult to do at first without any practice as the second ball drops just when you are dealing with the first. One way around this is to time the hits of the second player so that they are shorter than the first so the ball does not go up as high allowing you to sync up better and with a bit of luck getting them to fall at the same time.
We have more cheats and tips for this game here, Super Ball Juggling cheats
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