fatty thats bad advice. Legend of Zelda is a Nintendo trademark and copyright. Coz we all know Nintendo dont give a crap about mario just because it came out on the nes. You must live in some alternate world.
copying the levels is a trademark violation (super gianna sisters did this and was taken to court and lost and was removed from the shelves).
Nintendo dont care if its gba sprite sheets, its all copyright and still valid copyright (I really dont care about it but I aint a nintendo lawyer).