1) Battery Back-up
It was the first NES cartridge to provide an internal battery for saving data. When originally released for the Famicom Disk System, the game allowed for saving to re-writeable floppy disks for saves. The NES did not have the Famicom Disk System. Instead, the cartridge used battery-powered RAM, which allowed a player to save their game without the use of a password. Just remember to “Hold RESET while you turn POWER off!” on your NES 🙂
