Yonezawa PR21 (ヨネザワPR21) (also known as Party Room 21) released Family Computer and Super Famicom video games during the 1990s. They also published a game for the Game Boy. Most of the games produced were of the board game/trivia genres. Their most "notable" titles during their years of production were the Famicom game Battle Storm and the Super Famicom game Super Hockey '94.