Duo Sea Battle - Fold & Fire

Stand it up, hide your fleet

Only for iPhone

Expected Oct 23, 2026 · Free · In‑App Purchases

iPhone

Stand your foldable iPhone up in an L and it becomes the screen between two players. Both see only their own fleet and fire at once. Pass it closed, or play the AI. A pencil-and-paper sea battle for two, on one foldable iPhone. - Stand it up: it's the screen Stand it in an L and sit across the corner of a table. The device itself hides each fleet, so both players see their own ships at the same time. Try Salvo: aim as many shots as you have ships left, and fire together. - Close it to hide When closed, the outer display becomes the shared chart. Open it to see your own bridge. Every peek is recorded for everyone to see. - Play the AI Three levels: Cadet, Captain and Admiral. The AI commits to its fleet with a seal code before the game, so you can check it afterwards. The review shows how the AI weighed each square. - Tap to place Pick a ship and tap a square; tap again to rotate. Or let it place them for you. - Data No network and no account. Games are saved on this device only. - Price Free, with a banner ad. A one-time "Remove Ads" purchase removes the ads. - Note Made for the foldable iPhone. On an iPhone without a hinge you can still play the AI, or pass the phone between two players. Terms of Use: https://nayukitecture.com/works/duo-kaisen-terms-of-use.html

The developer, tasuku nayuki, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Used to Track You

    The following data may be used to track you across apps and websites owned by other companies:

    • Identifiers
    • Usage Data

  • Data Not Linked to You

    The following data may be collected but it is not linked to your identity:

    • Identifiers
    • Usage Data

Privacy practices may vary, for example, based on the features you use or your age. Learn More

Accessibility

The developer has not yet indicated which accessibility features this app supports. Learn More

Information

Seller
tasuku nayuki
Size
5.1 MB
Category
Board
Compatibility
Requires iOS 26.0 or later.
  • iPhone
    Requires iOS 26.0 or later.
  • Mac
    Requires macOS 26.0 or later and a Mac with Apple M1 chip or later.
  • Apple Vision
    Requires visionOS 26.0 or later.
Languages
English and Japanese
Age Rating
4+
In-App Purchases
Yes
Copyright
© 2026 Tasuku Nayuki
  • Developer Website
  • Privacy Policy

    • Supports

    • Family Sharing

      Some in-app purchases and subscriptions may be shareable with your family group when Family Sharing is enabled. Learn More

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