Now that Mario Golf 64 is on Switch, you may want this old cheat code
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Mario Tennis | Nintendo 64 | Games | Nintendo
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N64 Today on Twitter: "Mario Tennis on N64 has a number of different characters to choose from. Who's your go-to player? https://t.co/UrawQz4hIg" / Twitter
I'm ready to play Mario Tennis the way God intended. : r/n64
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Amazon.com: Mario Tennis Game Card for Nintendo 64 N64 US Version : Video Games
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Mario Power Tennis - Super Mario Wiki, the Mario encyclopedia