Mario's Castle (SMB1 Hack) ROM Download can be obtained free for Nintendo on EmuGames.net only. Play emulator game in English for the USA region. Mario's Castle is a NES ROM that you can download to your computer or play online within your browser. You can also download roms such as Mario's Picross 2 and Mario's Early Years Preschool Fun that work on all devices including desktop and mobile. Be sure to rate the game if you enjoyed playing this ROM.