Delta 2.0 Update Adds Genesis Support, iPhone Duo Screens

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The Delta 2.0 update launched Oct. 22, giving the retro-game emulator a dual-screen layout built specifically for Nintendo DS games on Apple's new iPhone Duo and adding Sega Genesis and Mega Drive emulation for every user. It's the first new system Delta has supported since its 2024 App Store debut, according to iThinkDiff. The release went live on the App Store and AltStore PAL in time for the Duo's Oct. 23 retail launch.

Delta's team called the update its "biggest update ever" in the release announcement, citing Genesis support, a Liquid Glass interface overhaul, and RetroAchievements tracking alongside the Duo-specific layouts. The app has passed 20 million downloads over the past two years, according to Delta's own figures.

What the Delta 2.0 update adds on iPhone Duo and other Apple devices

Delta remains a free download with optional in-app purchases, including a Become a Patron option, and runs on iPhone, iPad, Apple Silicon Mac, and Apple Vision devices. It supports Nintendo, PlayStation, and Xbox controllers.

This release also marks Delta's first official launch on the EU App Store, after an earlier obstacle tied to Apple's Core Technology Fee, which the developers said could have cost millions of dollars, was resolved. Delta remains available on AltStore PAL in the EU as well.

As with every system Delta supports, nothing comes preloaded. Users import their own game files for DS, Genesis, or any other platform the app emulates. Delta doesn't distribute ROMs.

Delta emulator Nintendo DS on iPhone Duo: how the dual-screen layout works

Delta's new Nintendo DS layouts stretch across the Duo's full inner display, wrapping over the hinge crease when the phone is partially folded into book mode, according to 9to5Mac.

Delta developer Riley Testut says the result is unlike anything the app has offered before, comparing the foldable experience to opening the original clamshell Nintendo DS from 2004.

Testut told The Verge that the controller skins are optimized for every folding position in both portrait and landscape. That matters for anyone switching between tabletop, half-folded, and flat positions during a session, since a layout designed for one position can become awkward in another.

Closing the Duo automatically puts an emulated DS game to sleep, echoing the lid-close behavior of the original console. Delta's interface also adapts to the Duo's outer display when the phone is closed.

In Split View, a Delta game can run alongside another app. The emulator uses a custom keyboard view to let the lower DS screen extend across the display, rather than remaining confined to a standard half-screen layout.

These capabilities are described in Delta's release materials and launch coverage. They establish how the app is designed to behave, although they don't provide independent measurements of crease visibility, touch responsiveness, or long-session usability.

Delta 2.0 Sega Genesis support: what changes for every user

Genesis and Mega Drive emulation is the first new platform Delta has added since its 2024 launch lineup of NES, SNES, Nintendo 64, Game Boy, Game Boy Color, Game Boy Advance, and Nintendo DS.

That's a substantial expansion beyond the app's Nintendo-only roots, not a minor add-on.

New controller skins recreate the look of the original Genesis controller, and the system supports save states and built-in Action Replay and Game Genie cheats, according to Digital Trends.

Playing requires importing your own Genesis game files, the same rule that applies to every other system in Delta.

The launch coverage doesn't establish support for Sega CD or 32X games, nor does it provide detailed information about regional ROM differences, BIOS requirements, or controller latency. Those are compatibility questions worth checking before assuming that every Genesis-related game format will work.

Delta 2.0 RetroAchievements support and other universal upgrades

RetroAchievements brings community-created achievement tracking to supported games, along with a Hardcore mode that disables save-state loading and cheats for players who want a stricter, achievement-focused experience.

Achievement progress now appears when a game launches rather than remaining buried in a menu.

Fast-forward settings can now be customized per game, and new audio controls let game sound mix with music or podcasts instead of automatically interrupting them.

Players using external controllers can long-press to reposition the game screen. Controller skins also support animation, including an official animated Game Boy Advance design.

The update fixes two specific bugs: crackling SNES audio and NES games that occasionally opened to a black screen.

On iPad, multitasking improvements accompany the ability to delete multiple save states at once instead of removing them individually.

The interface adopts Apple's Liquid Glass design across menus, system icons, and default game artwork. Delta also adds Recently Played and Favorites sections to its library.

These changes aren't limited to iPhone Duo owners. They're part of the broader Delta 2.0 release for supported Apple devices.

Experimental features and open questions in Delta 2.0

Delta 2.0 adds experimental support for Epilogue's GB Operator and SN Operator accessories, allowing owners to connect compatible physical cartridges to an iPhone or iPad, play their games through Delta, and read or write save files.

The supported cartridge formats depend on the accessory. Buyers should check Epilogue's compatibility information before purchasing either device.

Custom visual filters, including CRT-style effects and support for importing third-party filters, are also listed as experimental. Filters can be configured on a per-system basis.

Pokémon downloadable content is another addition, bringing community-created event items and rare Pokémon to mainline Game Boy Advance titles.

The initial availability of that content has been described differently across launch coverage. Digital Trends reported that the first Pokémon Emerald content was already accessible through Delta's pause menu, while Testut told The Verge that the first DLC was coming soon.

Those reports don't establish a single confirmed release date. Players interested in the feature should check the current version's pause menu and official release notes for availability.

What to check before updating

Delta's team is framing version 2.0 as a major milestone: a new emulated system, foldable-specific controller layouts, RetroAchievements, and the first official EU App Store release in one update.

The release is available through the App Store and AltStore PAL, with full details in Delta's official release notes.

iPhone Duo owners can update and try their own Nintendo DS game files in tabletop or half-folded mode to judge the dual-screen layout firsthand.

Anyone using another supported Apple device still gets Genesis emulation, RetroAchievements, interface changes, and bug fixes regardless of hardware.

Buyers considering an iPhone Duo primarily for DS emulation should compare independent hands-on impressions of hinge behavior, crease visibility, and touchscreen controls before treating Delta's layout as a reason to buy the phone.