how much can you edit?

[kuukuu]

to what extent can you replace graphics? like, can I make Link a cat, and edit tile sets? if so how hard is it? and what program is best to use?

[Asuna Yuuki Nagato]

Yes, by right clicking the tile and opening the "Select Tile" window.

*switches to Egorapter voice* The adventures of Link: cat delivery boy.