To put it directly:
Since the original website is no longer active for gameplay, use one of the following reliable methods to get the game running locally: BlueMaxima's Flashpoint super mario bros crossover nes rom download
Because the game features complex cross-engine physics, massive sprite sheets, and audio files from over a dozen different games, it could never run natively on original 8-bit NES hardware. It was coded entirely in ActionScript (Flash) for computers. Therefore, a true "NES ROM" version of this specific game does not exist. Beware of Fake Download Links To put it directly: Since the original website