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iPhone Duo goes on sale Oct 23, 2026. Developers are likely to update their apps then, so statuses are for reference until launch.

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Castle Busters

VoodooGames

View in the App Store
On iPhone Duo

Letterboxed

Castle Busters runs in an iPhone-sized window with black bars.

Its latest version is built with the iOS 26 SDK,[1] which Apple shows letterboxed on the inner display.[2]

How we know
From the app’s build
Checked on
Version 1.20.1
Build
iOS 26.2 SDK
Latest version
1.20.1, Oct 15, 2026
Status updated

What owners report

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Sources

  1. App Store build, version 1.20.1

    Built with the iOS 26.2 SDK. Uses none of Apple’s iPhone Duo APIs.

  2. Apple Developer: Prepare your app for iPhone Duo
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