Change the game type to basketball with wammy on. Whileplaying, make the ball go straight up and down, and not underneatha basket. While the ball is bouncing, hold Fire to enablethe wammy. Eventually your ball will be bouncing very high, andin time it will bounce through the roof then bounce from underthe floor.
To get easy points against your opponent, press Firewhen they are away from the net. This works about 85% of the time.