The correct rom has the name "Super Mario Brothers 2 (Japan).fds" and the md5 hash "7f38210a8a2befb8d347523b4ff6ae7c". To play it on emulator you also need an FDS bios file and your emulator must be able to run FDS games (FCEUX, Nestopia, Bizhawk all can).

There is a NES port by loopy that is somewhat accurate and useful for savestate practice on Powerpak. For all actual runs though please avoid using any ".nes" roms.