Sequel to "Trouble at Ganonco", with the original's overworld remade, plus another full overworld and several side areas. 8 main levels, plus a couple of optional levels and several side and mini levels. Also there is the "Gauntlet Tower" which contains useful items where another floor will open after each level.
http://www.purezc.com/index.php?page=quests&id=279
You will need Zelda 2.10
http://www.zeldaclassic.com/downloads.php#zc
Then get the update for Win 7
http://www.armageddongames.net/zeldaclassic/files/zc2102wl.zip