Instructions
Open the Cydia app store on your jailbroken iPhone. A jailbroken iPhone is one that has been hacked to remove the restrictions placed on the hardware by Apple, allowing it to run customized homebrew programs and be used on carriers that Apple does not have contracts with. Cydia automatically replaces the Apple apps store during the jailbreaking process.
Click the "Search" button in the bottom, right corner of the window and search for "SNES." A list of available emulators will appear. Download and install any of them you like. Some of the emulators cost money, but there are many free ones.
Exit the Cydia app store and return to your phone's homepage. Click the icon for your emulator to start it up.
Click "Games" from the emulator's menu. From the choices provided, choose "Find Game" to be linked to sites recommended by the app developer for downloading game files. Choose the site you prefer and browse the games are your leisure.