sentences:  Through the use of a Nintendo 64 Transfer Pak, players are able to import their characters from the Game Boy Color (GBC) version of "Mario Tennis" to the N64 game, as well as the characters' stats.After connecting "Mario Tennis" for GBC with "Mario Tennis" for the Nintendo 64, various characters become available; Yoshi, Wario, Waluigi and Bowser can be sent to the GBC version, and the GBC version characters Alex, Harry, Nina and Kate can be transferred to the Nintendo 64 version.Using the latter four characters, experience points may be earned to transfer back to the GBC version.