On the Super Famicom Satellaview there was a version of Zelda called BS Zelda (BS for Brodcast Satellaview). Gameplay was similar to the NES version of Legend of Zelda, except the game was played in real time. See the time clock in the upper right hand corner that says "Zelda time"? At set intervals players would get boomerang upgrades or for a short amount of time unlimited bombs. There were four episodes of BS Zelda and each episode had a remade map of the game to explore. Something else interesting to note is that players would use their Satellaview avatars in BS Zelda, which explains why Link isn’t the hero in the introductory clip.
Past the break is a video a gameplay video.