[Codein]

That's wrong. The way I did it is right. addtiledef2 is used for adding a group of tiles which doesn't necessarily mean changing the whole entire tileset. For example, if I wanted to change tall grass, I'd use addtiledef2 but if I had completely new tileset, I'd use addtiledef. Type 1 is what Era uses and is more organised where as type 0 is the one which classic uses and is used when you have a new tileset where you don't want to change the layout, mainly used if you already have an overworld.