Help & Support

Effective / updated October 31, 2026

1. How to play

Fill the blanks so that every horizontal and vertical equation is correct. Tap a number tile and then a blank cell (or tap a blank first, then a tile), or drag the tile. Each tile can be used once. Wrong equations are marked; undo and reset are below the board. Open the grid icon to choose among 1,000 stages. A short tutorial runs on the first launch and can be replayed in Settings.

2. Hints, ads and purchases

You start with 3 hints and receive 2 free hints every day (the day changes at midnight Korea time; unused free hints do not accumulate). Hints and ad rewards are granted by our server, so connect to the internet. A rewarded ad gives a hint only after the server has verified it; if it does not arrive, reopen the app. Ad removal and Restore purchase are in Settings (gear icon); restore works with the store account used for the purchase.

3. Report an issue

E-mail dhalska2@gmail.com with the subject Number Cross, the app version, your device and OS, and the steps to reproduce (a screenshot without personal data helps). Do not send passwords or card details. Billing and refunds are handled through the Apple or Google Play support process.