It's been no secret, I've been sitting on this for about 2 weeks, just changed the Overworld, and it's done.
Video playlist (for those who want to judge and don't have much time): http://www.youtube.com/playlist?list...FunPKBaUoN6JUO
Original Link: https://dl.dropboxusercontent.com/u/...hnightmare.zip
Final version: https://dl.dropboxusercontent.com/u/...mare-final.zip
Demo tiles version is now taken down due to the quest going final, sorry guys.
As an overall note, I was relatively disgusted by the way the 4th Quest deviated from the Zelda 1 formula too much and went to design a mostly hardcore quest with a few new changes. I accentuated the new flags, put in Golden Rupee items, and added a few new items and enemies here and there (say hello to sword-throwing Darknuts!). I also went for large dungeon sizes over small to challenge the player and see how they do over the long run.