Calm Sudoku · 静心数独 — Support

A quiet, ad-free sudoku app for everyday focus.

Contact

Email: [email protected]

We read every message. For the fastest reply, please include:

• The version number you’re running (Settings → bottom of the page)
• A short description of what happened
• A screenshot, if helpful

Frequently asked

How do I switch language?

Settings → Language → choose English or 中文 (简体). The whole app — including hint explanations — switches immediately.

How do hints work?

Tap Hint during a game. Calm Sudoku shows the technique (e.g., “this cell can only be 5”) rather than just the answer, so you learn while you play.

You can dismiss the hint without using it. Only confirmed hints count toward your hint usage.

How do I save my progress?

You don’t have to. Calm Sudoku auto-saves every move. Quit any time and pick up exactly where you left off.

What’s in Calm Sudoku Premium?

A one-time, $4.99 purchase that unlocks:

• Expert difficulty tier
• 2,000+ additional puzzles across all difficulties
• Unlimited hints
• Advanced statistics — averages, days played, recent solves
• Daily puzzle archive — replay puzzles from the previous 30 days

It’s a single purchase. No subscription. No auto-renewal. Buy once, keep forever.

How do I restore my Premium purchase on a new device?

Open the Premium screen → tap Already purchased? Restore. As long as you’re signed in to the same Apple ID, your purchase will come back.