Underhalt

Read the corridor. Survive.

$0.99 · Designed for iPad. Not verified for macOS.

An atmospheric offline anomaly hunt built on observation, not jump scares: walk the same service corridor across twelve night shifts and learn to spot what changed. Underhalt is an atmospheric, offline anomaly hunt built around careful observation rather than jump-scare reflexes. Walk the same subterranean service corridor across twelve night shifts. Learn its baseline geometry, fixture rhythm, signs, doors, and shadows. Then decide: has the corridor changed, or is your own memory becoming unreliable? FEATURES - A real-time 3D corridor rendered on device - Twelve authored anomaly families with multiple variants - Deterministic shift generation for fair, replayable runs - A stability system that rewards accurate streaks - Flashlight management and changing visibility - A persistent deviation archive - No ads, no accounts, no in-app purchases, and no network connection One purchase opens the entire building.

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Version 2.0 adds a complete night-investigation lifecycle with deterministic operations, forensic instruments, persistent evidence, signal convergence, final diagnosis, scored reports, a Night Ledger, sharing, and visual anomaly files This release also refreshes the native iPhone and iPad experience, accessibility, privacy boundaries, and App Store screenshots. There are no accounts, subscriptions, advertising, tracking, or developer-operated services.

Version 2.0

The developer, Robert Corbin, 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 Not Collected

    The developer does not collect any data from this app.

    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
    Robert Corbin
    Size
    84.6 MB
    Category
    Adventure
    Compatibility
    Requires iOS 17.0 or later.
    • iPhone
      Requires iOS 17.0 or later.
    • iPad
      Requires iPadOS 17.0 or later.
    • Mac
      Requires macOS 14.0 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 1.0 or later.
    Languages
    English
    Age Rating
    9+
    Copyright
    © 2026 Shadowfetch
  • Developer Website
  • Privacy Policy

    • Supports

    • Family Sharing

      Up to six family members can use this app with Family Sharing enabled.

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