Tennis Cheats for GameBoy

Press A + B + Select + Start at the title screen when selecting a one player game.

During a serve, throw the ball up and position your player directly underneath in order to have the ball land on your head. This will result in a point in your favor. Repeat this to win the match.

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Tennis Items

Throw the ball in the air and instead of serving walk under the ball so it lands on your head. For some reason you'll be awarded the point.