# PipeFlow - Pipe Puzzle — 10000 procedural pipe puzzles

> 10000 procedural pipe puzzles (iPhone/iPad app by 应龙 张.)

- Source: https://appshunter.io/ios/app/pipeflow-pipe-puzzle/id6769325635 (this page in markdown: same URL + `.md`)
- Developer: [应龙 张](https://appshunter.io/developer/1514562080)
- Category: Games
- Price: Free (on sale, was $1.99)
- Age rating: 4+
- Requires: iOS 16.0 · 1 MB
- Languages: American English, Chinese (Simplified, China)
- Released: 2026-05-14
- Data updated: 2026-05-31
- User reviews in markdown: https://appshunter.io/ios/app/pipeflow-pipe-puzzle/id6769325635/reviews.md

## What is PipeFlow?

PipeFlow is a native pipe-connection puzzle built with SwiftUI for iOS 16 and later. Lightweight, fluid, and engineered for clarity.

LEVEL ENGINE
- Deterministic xorshift64 seeded generation
- Self-avoiding random walk path builder
- Eight difficulty curves: 5x5 through 9x9
- Adaptive path length from 6 to 78 tiles
- 100% guaranteed solvable on every level
- All 10000 levels reproducible by seed

CORE ALGORITHMS
- 4-bit directional bitmask for pipe connectivity
- Depth-first connectivity check for win detection
- Real-time flow reachability for visual hinting

PERFORMANCE
- Tiny binary, zero third-party dependencies
- Millisecond cold launch via UserDefaults persistence
- Under 50 MB memory footprint
- Clean background / foreground lifecycle

COMPLIANCE AND PRIVACY
- Fully offline, no network requests, ever
- Zero system permissions requested
- No device identifiers, no user data collected
- Apple App Privacy label: Data Not Collected

LOCALIZATION
- English (US) and Simplified Chinese
- Powered by Xcode String Catalog

INTERACTION DETAILS
- Light haptics on every rotation
- Success haptics on level clear
- 0.1-second precision local timer
- Persisted best time per level

SUPPORTED DEVICES
- iPhone 6.1" and 6.7", portrait only
- Minimum OS: iOS 16.0

No sign-up, no network, no payment. Install and play.


## Version history (last 1 release)

### 1.0 — 2026-05-14

No release notes.

## More apps by 应龙 张

- [Cube Master Studio](https://appshunter.io/ios/app/cube-master-studio/id6768941523)
- [Mine Clear Classic](https://appshunter.io/ios/app/mine-clear-classic/id6768963425)
- [QR Art Master](https://appshunter.io/ios/app/qr-art-master/id6769301502)
- [Ace Fighter Sky](https://appshunter.io/ios/app/ace-fighter-sky/id6769322047)
- [ARuler Pro 2026](https://appshunter.io/ios/app/aruler-pro-2026/id6770253108)

All apps by 应龙 张: https://appshunter.io/developer/1514562080

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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 2026-05-31.*