Games v1.1.3
Does Brain Puzzle 3 work on iPhone Duo?
It works, but with black bars. Brain Puzzle 3 1.1.3 is built with the iOS 26.5 SDK, so iPhone Duo runs it in a phone-sized window on the inner display.
At a glance
- Inner display (7.6″)
- Black bars
- Outer display (5.4″)
- Works normally
- Built with
- iOS 26.5 SDK
- Version 1.1.3, read Oct 25, 2026
- iPad version
- Yes
- Layout already handles big screens
- Latest version
- v1.1.3
- Oct 14, 2026
- Duo in release notes
- Not yet
About Brain Puzzle 3
Brain Puzzle 3 is made by SmallStep Dev Team and first came out on the App Store in December 2025. It's #12 on today's US App Store top charts. It has 29,127 ratings on the US App Store, averaging 4.6 stars. Version 1.1.3 came out on Oct 14, 2026 and needs iOS 15.0 or later. It's free to download. Among the 238 games we track on the US App Store, 34 already fill the inner display, 9 are partly adapted and 187 still show black bars. By number of ratings, Brain Puzzle 3 is #158 of them.
From its App Store listing:
Warning: This game may cause intermittent frustration, sudden bursts of laughter, and a strong desire to show off to your friends! Welcome to Brain Puzzle 3: Crazy Mind, the newest adventure in the Brain Puzzle series! Get ready for an exciting Brain Puzzle game experience filled with creative challenges, tricky levels, and unexpected solutions. Brain Puzzle 3 brings you a collection of fun brain …
On the inner display
Apps built with older SDKs are placed in a phone-sized safe area on a black background. Everything works; you just don't get the bigger screen.
In Split View
iPhone Duo is the first iPhone that can show two apps side by side, and every app takes part — including Brain Puzzle 3. Open it on the inner display, then add a second app next to it. You can save the pair and come back to it later.
Duo-specific features
None confirmed yet. Duo-specific features include side toolbars, layouts that react to the fold, and content on the outer display while the app is open inside.
Evidence & history
App build,
Version 1.1.3 is built with the iOS 26.5 SDK
Apple runs apps built with the iOS 26 SDK or earlier in a phone-sized window on the inner display.
- : Not confirmed yet → Black bars — built with the iOS 26.5 SDK
Latest release notes
Version 1.1.3 · Oct 14, 2026
• Fixed some bugs • Improved game stability
Questions
Does Brain Puzzle 3 work on iPhone Duo?
It works, but with black bars. Brain Puzzle 3 1.1.3 is built with the iOS 26.5 SDK, so iPhone Duo runs it in a phone-sized window on the inner display.
Does Brain Puzzle 3 work on the outer display?
Yes. iPhone Duo's 5.4-inch outer display behaves like a regular iPhone screen, so every iPhone app works there as usual.
Can I use Brain Puzzle 3 in Split View on iPhone Duo?
Yes. On iPhone Duo every app can be placed side by side with another app on the inner display — developers don't need to opt in. How comfortable it feels at half width depends on the app's layout.
Why does Brain Puzzle 3 have black bars on iPhone Duo?
Apps built with the iOS 26 SDK or earlier run in a phone-sized window on the inner display, and iOS 27 builds can still leave some space empty. The bars disappear once the developer rebuilds the app with the iOS 27.1 SDK — you only need to update the app.
When will Brain Puzzle 3 fill iPhone Duo's inner display?
When its developer releases an update built with the iOS 27.1 SDK or later. We read the SDK of every new version of Brain Puzzle 3 within about a day of its release and update this page.
What can I do about the black bars until then?
Use Brain Puzzle 3 on the outer display, where it works like on any iPhone, or put it in Split View next to another app on the inner display so less of the screen goes unused.