Konami Game Master
The Game Master (Japanese: コナミのゲームを10倍楽しむカートリッジ, Hepburn: Konami no Gēmu o Jū-bai Tanoshimu Kātorijji; lit. "The Cartridge That Makes Konami Games Ten Times More Enjoyable") is a utility cartridge released by Konami on December 12, 1985 in Japan and Europe.