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Apple officially allows retro game emulators on the App Store
Retro gaming console emulator apps are now welcome on the Apple App Store and can even offer downloadable games.
Emulator software wasn't allowed on the App Store prior to this update, though developers have been finding ways to distribute them to iOS users. To be able to install them, users usually need to resort to jailbreaking and downloading sideloading tools or unsanctioned alternate app stores first. Any app offering titles for download that the developer doesn't own the rights to is a no-no, so fans of specific consoles will just have to hope that their companies are planning to release official emulators for iOS.
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