Playing classic video game ROMs on the iPhone has typically required jailbreaking in the past, but webNES is a browser-based solution that gives everyone access to their own playable NES libraries. According to TouchArcade, webNES works in conjunction with Dropbox, so in order to play NES games on the web app, you’ll have to store NES ROMs in your Dropbox account and then log in through webNES. Once the files are in your Dropbox, you will be able to select one to play inside the app. You can try it out by navigating to webn.es on your smartphone where the creators have provided a few sample games. Just hit the + symbol in the top right corner of the page to access your Dropbox files. It’s not perfect, but it’s the simplest way to play NES games on the iPhone.