Support

Last updated: October 3, 2026

How to play and frequently asked questions.

How to play

1. Tap a cell, then tap a number below to fill it in.
2. Tap "Notes" to write small candidate numbers in a cell.
3. Three mistakes end the game. Watch a short ad to continue or start over.
4. Stuck? Tap "Hint". It shows the next move, the technique and the reason.

Levels

Easy (30), Medium (50), Hard (50), Expert (100) and Oni (770). Every puzzle has one solution and can be solved with logic alone, using the techniques taught in the App.

Frequently asked questions

Can I play offline?

Yes. Puzzles, hints and lessons work without a connection. Ads need a connection.

Will I lose my progress if I change phones?

Progress is saved only on your device, so it does not move to a new phone.

How do I change the language?

The App follows your device language: English, Japanese or Spanish. Other languages show English.

How do I change ad personalization?

See sections 4 and 6 of the Privacy Policy.

Contact

Email: info@arupmt.com