Games v1.21.0
Does Castle Busters work on iPhone Duo?
Yes. Castle Busters is built for iPhone Duo — it runs full screen on the 7.6-inch inner display and adapts its layout for the fold.
At a glance
- Inner display (7.6″)
- Built for Duo
- Outer display (5.4″)
- Works normally
- Built with
- Not read yet
- We read each app's build SDK after it updates
- iPad version
- Yes
- Layout already handles big screens
- Latest version
- v1.21.0
- Oct 28, 2026
- Duo in release notes
- Not yet
About Castle Busters
Castle Busters is made by Voodoo and first came out on the App Store in May 2025. It's #47 on today's US App Store top charts. It has 111,019 ratings on the US App Store, averaging 4.6 stars. Version 1.21.0 came out on Oct 28, 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, Castle Busters is #108 of them.
From its App Store listing:
SMASH EVERY CASTLE. RULE EVERY ARENA. Build your defenses, choose your crew, and smash your opponent's hard work to pieces in Castle Busters, a turn-based online PvP battle game. Just you, your rival, and two castles that won't both survive the match intact. And you'd only just finished decorating! MAKE EVERY SHOT COUNT Take aim and fire. Your crew brought the firepower. Your opponent kindly suppl…
On the inner display
The app reaches the edges of the inner display. Text and controls stay a comfortable size instead of being blown up.
In Split View
iPhone Duo is the first iPhone that can show two apps side by side, and every app takes part — including Castle Busters. 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 Store,
App Store listing has screenshots made for iPhone Duo
The developer published 5 screenshots for iPhone Duo’s inner display.
- : Not confirmed yet → Built for Duo — its App Store listing has iPhone Duo screenshots
Latest release notes
Version 1.21.0 · Oct 28, 2026
Improvements and bug fixes.
Questions
Does Castle Busters work on iPhone Duo?
Yes. Castle Busters is built for iPhone Duo — it runs full screen on the 7.6-inch inner display and adapts its layout for the fold.
Does Castle Busters 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 Castle Busters 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.