BS The Legend of Zelda (BSゼルダの伝説, BS Zeruda no Densetsu) was a remake of the NES game The Legend of Zelda, released for the Satellaview attachment for the Super Famicom in Japan.
BS stands for Broadcast Satellaview (commonly referred to as the BS-X). Using this add-on gamers could download the game from the satellite and save it onto either the base unit’s memory or onto a BS-X Special Broadcast Cassette (but only Triforce of the Gods could be played outside of broadcast time).