u/Equal-Software1263

The first time I played New Super Mario Bros I was probably 10 and had no idea at the time until I was older and seen many playthroughs of the game it was modded. And most of my cartridge was untouched except for the last boss was Dark Bowser instead of normal Bowser. Initially when I saw playthroughs I thought I did something really special and was a silly kid thinking I had a "personalized copy" of the game, something like the M64 rumors going on. But nope, it's just a neat little ROM hack. But it was so magical to me I'm wondering how could one play that hack?