@Kaizoman: I think Nintendo even bother to make a invisible solid block sprite because on the cloud/forest tileset. The place where the switch place corner in map16 (the block is 110) is replace with a forest corner piece that isn't solid on the side.
@Shadowed Reaper: All the above, but not sure with the "amount of time on hand" because most kaizo hacks are really short.
@Shadowed Reaper: All the above, but not sure with the "amount of time on hand" because most kaizo hacks are really short.