A puzzle box game where the Duo is the box: shut to read the lid, open a crack to peek
Does Foldlock work on iPhone Duo?
Yes, from launch day, says its App Store page: closed, the cover is the lid of the box; open it a crack and lamplight spills through; stand it up and the lid becomes a mirror.
- App Store confirmedTenth Room Studio, the one-person studio of Kane Vu, in a submission to FoldHunt on October 28, 2026, and on the Foldlock website. The App Store seller is Ky Anh Vu. Foldlock came out on October 26, 2026, and its App Store description says it was built for iPhone Duo. The website's pictures match the Duo's screen sizes but show no status bar.
Adapted for the fold
- Closed · Outer display
The lid of the box
Folded, the cover is the box's lid, with its inlay, locks and clues that only show when it's shut.
- Book · Partly folded
Light through the crack
Open it a crack and lamplight falls through the gap, showing things in the dark that never show in full light.
- Book · Partly folded
The lid stands up
Open it flat, then fold it back like a laptop, and the lid stands up as a mirror, a lantern or a lens.
- Open · Inner display
Everything laid out
Open flat, everything inside is laid out: drawers, dials, wheels and keys.
About Foldlock
Foldlock is a puzzle box game from Tenth Room Studio, the maker of Keep It Shut. Six folding boxes, a locksmith’s ledger, a ship surgeon’s case, a child’s music box, a folding chessboard and a lighthouse painting among them, each lock away a letter that was never sent, across 48 puzzles. It costs $4.99 once, with no ads, purchases or accounts, and syncs through iCloud.
Every box folds the way iPhone Duo does. Shut, the cover is the lid; opened a crack, lamplight spills through; folded back like a laptop, the lid stands up as a mirror, lantern or lens; and laid flat, the drawers, dials and keys are spread out. The game reads the hinge angle in a few wide steps. On other iPhones a brass lever on screen moves the lid.
Evidence reviews
What we checked, when, and what the evidence establishes. Each record preserves the support label at that check.
· App Store page reviewed
App Store confirmed · iphone-duo
The App Store description mentions iPhone Duo: "On iPhone Duo, the hinge is the lid." (version 1.0.2, released October 28, 2026).
App version: 1.0.2.
Store text only: we haven't seen the app running, and the store page doesn't show how each pose is used.
View reviewed evidence ↗
Related guides
iPhone Duo games: what's coming, and what the fold does for play
Which games have been shown on iPhone Duo, how un-updated games look on the open display, and the new kinds of play builders are making with the hinge, the half fold and two screens.
iPhone Duo poses: closed, open, book, standing and Split View
A plain-language guide to the ways you will hold iPhone Duo, what the phone itself does in each, and the apps and ideas that make the most of them. For anyone buying one, and for anyone building for it.
The best iPhone Duo apps so far (October 2026)
The apps worth installing now that iPhone Duo is on sale, from the apps Apple named as launch partners to indie apps whose developers have shown a real iPhone Duo layout, picked for what they do when you open the phone.
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Sources: Foldlock website (tenthroomstudio.com) · Foldlock on the App Store (apps.apple.com)
More for iPhone Duo
Find Objects: Hidden & Diff
Nguyen Vinh
A cozy hidden-object game where spot the difference opens like a book across the fold
Simulator verified: Nguyen Vinh, the developer, in a submission to FoldHunt on October 26, 2026, with a 24-second recording from the iPhone Duo simulator and a public TestFlight. The App Store seller is Nguyen Vinh. The release notes for version 1.2.6 (released October 24, 2026) say it is made for iPhone Duo.
- Open
- Closed
Starlift: Falling Block Puzzle
Banjo Obayomi
A block-launching puzzle game where two players face off across the Duo's fold
Simulator verified: Banjo Obayomi, the developer, in an email to FoldHunt on October 22, 2026, and posting as banjtheman in a comment on r/iosgaming. The press kit says the Duo support was built in Apple's simulator ahead of the hardware, and has unframed iPhone Duo screenshots at the size of the simulator's open display. The App Store seller is Temidayo Obayomi. The notes for version 1.0.1 (released October 17, 2026) say keepers beaten together in Team Boss on iPhone Duo are now saved.
- Open
- Closed
Blackbox
Ryan McLeod / Shapes and Stories LLC
Puzzles you solve without touching the screen, adapted to every pose of the Duo
Simulator verified: Shapes and Stories, Ryan McLeod's studio and the developer, in a submission to FoldHunt on October 17, 2026, saying the challenges and every part of the interface adapt to the iPhone Duo's poses, sometimes with new ways to play, ready for launch day. In an email that followed, Ryan said the Duo build has been tested extensively in the simulator. The press kit's iPhone Duo section (blackboxpuzzles.com) shows the game on a rendered Duo closed, open, half-folded and standing as a tent. Version 3.3 on the App Store (released October 22, 2026) says "Over 100 views were rebuilt so you can fold, stretch, rotate Blackbox all day long" but doesn't name the Duo.
- Open
- Book
- Standing