Title - Super Mario Bros. / Duck Hunt. Nintendo Entertainment System NES Cartridge Only Format - Nintendo Entertainment System Condition - Used Condition Notes - item is tested and working, light wear. cartridge only Please refer to the condition description for more information. All items are guaranteed to work, however CD-Keys and Digital Download Coupons may not be valid. Additionally, each game may only run on certain systems that meet their requirements, may no longer be supported by their publisher, or require additional software or subscriptions in order to play. We are not responsible in such an event.