MemoryFlip is a structured working-memory trainer in the format of a classic match-the-pairs card game. Built for repeatable daily practice, with measurable progress. SCORING MODEL Final score = pairs × 100 × difficulty multiplier − time penalty (sec × 2) − excess move penalty (extra moves × 5). Every session is logged with theme, difficulty, time, moves and score, so you can compare runs over time and observe genuine improvement. DIFFICULTY TIERS • Easy — 3×4 board, 6 pairs, multiplier ×1 • Medium — 4×4 board, 8 pairs, multiplier ×2 • Hard — 5×6 board, 15 pairs, multiplier ×3 • Expert — 6×6 board, 18 pairs, multiplier ×5 CARD DECKS (THEMES) Animals · Fruits · Emoji · Vehicles · Sports · Nature. Each deck provides up to 36 distinct symbols; symbols are randomly sampled and shuffled per session to prevent positional memorization. CORE FEATURES • Pre-game preview phase to encode the layout • Real-time HUD: timer, move counter, pair progress • Pause / resume / restart at any moment • Personal best per (theme × difficulty) combination • Full session history (last 100 sessions) • Optional sound effects and haptic feedback • Light / Dark / System appearance • Localized in English and 简体中文 PRIVACY & PERFORMANCE • 100% offline. No account, no signup, no network calls • No ads, no in-app purchases, no third-party SDKs • No analytics, no telemetry, no tracking • Data stored locally via UserDefaults; deleted with the app • iPhone-only, optimized for iOS 17+ • Minimal install footprint, instant launch USE CASES • 3-minute cognitive warm-up before deep work • Family-friendly play for children and elders • ADHD / focus self-training between tasks • A pure, distraction-free card game on your iPhone Download MemoryFlip and start measuring your memory.