Here’s a write-up you can use for a blog, forum post, or guide. I’ve included about the legal and technical aspects since "ROM fixes" often require careful handling. Super Mario Bros. Crossover: The Ultimate NES Mashup & How to Get the Fixed ROM If you’ve ever dreamed of blasting through World 1-1 as Contra’s Bill Rizer, whipping blocks like Simon Belmont, or blasting Goombas with Samus Aran’s arm cannon, then Super Mario Bros. Crossover is your dream come true. This legendary fan game reimagines the original Super Mario Bros. NES classic, replacing Mario with a roster of retro icons—each with their own unique physics, weapons, and controls.