# Underhalt — Read the corridor. Survive.

> Read the corridor. Survive. (iPhone/iPad app by Robert Corbin.)

- Source: https://appshunter.io/ios/app/underhalt/id6792957251 (this page in markdown: same URL + `.md`)
- Developer: [Robert Corbin](https://appshunter.io/developer/1890247992)
- Category: Games, Adventure, Puzzle
- Price: $1.99
- Age rating: 9+
- Requires: iOS 17.0 · 81 MB
- Languages: American English
- Released: 2026-07-30
- Data updated: 2026-09-10
- User reviews in markdown: https://appshunter.io/ios/app/underhalt/id6792957251/reviews.md

## What is Underhalt?

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.


## Version history (last 2 releases)

### 2.0 — 2026-08-21

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.

### 1.0 — 2026-07-30

No release notes.

## More apps by Robert Corbin

- [Daily Word Journey](https://appshunter.io/ios/app/daily-word-journey/id6761548266)
- [Hush Secret Text](https://appshunter.io/ios/app/hush-secret-text/id6761658175)
- [Renew Guard](https://appshunter.io/ios/app/renew-guard/id6761755447)
- [Receipt to PDF](https://appshunter.io/ios/app/receipt-to-pdf/id6761782025)
- [Route Your Pay](https://appshunter.io/ios/app/route-your-pay/id6761783719)
- [Tip Arbiter](https://appshunter.io/ios/app/tip-arbiter/id6761786879)

All apps by Robert Corbin: https://appshunter.io/developer/1890247992

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-10.*