Delta can turn the iPhone Duo into your favorite folding handheld
The Delta gaming emulator has been upgraded with a plethora of new goodies and support updates, which includes optimizing it for Apple's iPhone Duo. Delta 2.0 also introduces Sega Genesis games, animated controller skins, custom Pokémon DLC experiences, and a new UI that was built around supporting Liquid Glass.
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Summary from The Verge.
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The Verge Delta can turn the iPhone Duo into your favorite folding handheld · Jess Weatherbed
9to5Mac Retro game emulator Delta looks great on the iPhone Duo · Benjamin Mayo
Android Authority Delta emulator now lets you turn your iPhone Duo into a Nintendo DS · Aamir Siddiqui