I almost cried.
Not really - but I unlocked the first two sets of retro levels tonight.  Obviously, the one based off of Link's Awakening was going to be awesome - but I seriously didn't expect it to be quite as awesome as it was.  Part of me wishes I had an Action Replay that would let me go around the artificial boundaries that lock you inside the Four Swords levels and visit the rest of the island.  Obviously, I know that's not possible... but...
Also, the New-to-Four-Swords Item is awesome.  At first, I thought it was just a statue, like an Easter egg... but then, I looked at it and realized it was on an item pedestal[/quote].  So awesome.