King Koopa (Mario Bros Hack) ROM Download for Nintendo (NES) on Emulator Games. Play King Koopa (Mario Bros Hack) game that is available in the United States of America (USA) version only on this website. King Koopa (Mario Bros 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 King Of Fighters 99, Koopa Invaders (Space Invaders Hack) and Mario Zelda (Mario Bros Hack) as shown below. King Koopa (Mario Bros Hack) works on all your devices in high quality.