Monster Bros (SMB1 Hack) ROM Download for Nintendo (NES) on Emulator Games. Play Monster Bros (SMB1 Hack) game that is available in the United States of America (USA) version only on this website. Monster Bros (SMB1 Hack) is a Nintendo emulator game that you can download to your computer or play online within your browser. You can also download free ROMs such as Godzilla - Monster Of Monsters!, Super Mario Bros 3 and Super Luigi Bros (SMB1 Hack) as shown below. Monster Bros (SMB1 Hack) works on all your devices in high quality.