PipeFlow - Pipe Puzzle

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.