Quick briefing: BS Zelda's a "remixed" version of the original Legend of Zelda released via the Broadcast Satellaview peripheral for the Super Famicom. Obviously, it's originally Japan-only and fairly impossible to find in a "regular" format.
The version I'm playing is called The Legend of Zelda: Third Quest, which translates the game into English, splices the four weekly episodes into one game, and eliminates the timer element in the original because I'm a scrub going in blind. I might play the timer version eventually. If you want to play any version, it's pretty easy to web search. Anyway, enjoy.