When I was a kid I used to play The Adventures of Link like crazy. One day, after finishing it maybe twice in a row in one sitting, I saved my game and instead of level 9 sword, I had level 0. Whenever I played with this character I killed everything (even the angel of death) in one hit. The only thing that took more than one hit was my shadow (which you fight right at the end). One day a cousin came over and deleted the saved game and I never got it to happen again.
Does anyone know how this occurred or what the story was behind it? I assume I somehow got the game into some kind of dev mode, but it wasn't intentional (I was like 13). What were the steps to do it?
This isn't urgent, I've just been curious about it for ages.