I made a "new dungeon" by taking away some of the entrances to Cardia, and making a dungeon there, it worked pretty well. You can't actually expand the memory capacity of the game, which seems to be what you want to do.

I mean, my hack is quite different from the original game, for the most part, but I've actually used up all the memory, and now there are graphical errors in either the grass background, or Titan's tunnel... which is actually now a secret area...

THE JACKEL