I'm currently trying to import some of the boards from the custom boards download tab, but on the ROM I'm working with, I'm only able to overwrite DK's Jungle Adventure. All the other boards display "Board cannot be overwritten currently" for all the different custom board files I use. I assume there is a limit to spaces or specific types of spaces necessary to map a custom board onto a board on the ROM. How can I overwrite the other boards in the game, or where can I find the limitations of each board that would allow me to map custom boards onto them?