You earn belts (White → Black → higher Dan grades) as your lifetime skill grows. Harder difficulties, longer streaks, and clean solves (few mistakes, no wasted hints) move you up faster.
Five graded levels from Easy to Master. Every puzzle is guaranteed logically solvable — you never need to guess.
Sign in with Game Center and your level, stats, and awards follow you across your devices.
Use Settings → Delete Account in the app, or email support@ahm-technology.com to request deletion.
Email support@ahm-technology.com with your device model, iOS version, and what you were doing. Screenshots help.