Mario's Tennis

"Mario's Tennis (マリオズテニス) is a game for Nintendo's Virtual Boy video game console. Also known by its working title Mario's Dream Tennis, it was the console's pack-in game in North America. The game features eight famous characters from the Mario series. Although a two-player function was announced, it was not implemented since the cable required to link two Virtual Boy units was never released. Due to the Virtual Boy's poor sales in North America, Mario's Tennis did not become as popular as the other games in the Mario Tennis series." Source: Wikipedia, "Mario's_Tennis," available under the CC-BY-SA License.