Practice and answers
Choose a level and question count on the app home screen. Use the chart pattern—1 more or less across, 10 more or less vertically—to fill missing cells. When error hints are enabled, an incorrect cell is marked immediately.
If a question stops responding, return to Home and reopen the session. If the problem continues, tell us the level, question count, and steps that led to it.
Download and updates
Use the App Store for iPhone and iPad. Google Play will become available after review is complete.
If an App Store link opens the storefront home page, choose the storefront matching your Apple Account region, or search the App Store for “Hundreds Chart” or “百数图.”
Accounts, Premium, and purchases
For sign-in, Premium access, or restore-purchase issues, check your connection and use the same store account that made the purchase. You may include the order number and a screenshot; never email a card number, password, or full payment credential.
Contact and feedback
The best route is “Parent page — Feedback” inside the app, which includes the app version and basic device details needed for diagnosis. You can also email service@mogenkeji.com.
For a child privacy request, data rights request, or account deletion, state the request in the subject line. We normally respond within 15 business days after identity verification.
