The trick on level 25 is to watch the ball physics on the paddle: bouncing the ball on the right side of the paddle will send the ball to the right, bouncing it on the left side will send it to the left. Now you should be able to use only the top and bottom paddle and just use the side paddles in case of emergencies. If you're lucky you can also try and send to ball in a straight line up and then don't touch the paddles anymore, just watch the counter hitting zero :)
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