Karaoke Studio (カラオケスタジオ, Karaoke Sutajio) is a music video game designed for Nintendo's Family Computer. Physically the game acts as a subsystem designed to be inserted into the Family Computer cartridge slot. Several levels of the game can be played on the subsystem alone, and additionally, smaller expansion cartridges (originally available for separate purchase) providing additional levels and other new content can be plugged directly into the Karaoke Studio subsystem. The game comes with a microphone peripheral capable of detecting a human voice.

Karate Champ, known in Japan as Karate Dō (空手道, "The Way of the Empty Hand"?) is a 1984 arcade game developed by Technōs Japan for Data East.

Kart Fighter (Chinese: 瑪莉快打; pinyin: Mǎ lì kuài dǎ, lit. "Mario Fighter") is an unlicensed 2D fighting game produced for the Nintendo Famicom. The game features unauthorized appearances by Nintendo's mascot Mario and the rest of the cast of Super Mario Kart in a port of Street Fighter II. Since its release, Kart Fighter has received some media attention, including mostly positive reviews, in part because of its perceived similarity to the later Super Smash Bros. series.