Well, in your day, (assuming this is Zelda 1) you would need a bow and a silver arrow. Also, there was a minimum of 10 hearts you had to take to battle, has you could not leave the boos room without picking one up.
Yeah your right about the hearts lol. I did kill him with just my green mail though and no potions though. Wish I had that much time to spend on games today.
I have a 3ds, and I got it close to when it came out, do I have that and 2 and a lot of old games, but I am not good at it, I haven't found the second dungeon yet