I also want to add that what it replaces does not save to the cartridge. Any changes made to the game through HANS does not save to the cartridge. So you can play the game in a different 3DS and it'll be the same as if HANS was never used at all on the cartridge.It reads from both the cartridge and the SD card. Essentially, if a file on the SD card is the same as a file on the cartridge, the SD card file overwrites the one on the cartridge.






