clegion said:It is, you have to do the whole thing from scratch , like say programming back the character status (e.g friend-> enemy for instance), building the whole place, putting it into the game, see to that the programming doesn't have any bugs and so on. Even if it isn't that hard, it is a hassle
This part wouldn't be very hard, I think. You could just use rooms that are already in the game as a base.
Of course, I'm no romhackologist so I could be wrong.