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Mario's TennisKeep the ball in the court Harder level
Keep the ball in the courtSent in by Tim Rich When in the front of the court during doubles, never press the "B" button just to make sure the ball doesn't go out of bounds to give the other team a point.
Harder levelSent in by Brian Churchhill. At the title screen type L, L, R, L, R, Select for a harder level. The L & R buttons apply to the grey buttons on the back of the controller.