Support

Sudoku Duel · By Perrerscode · Last updated: 16 May 2026

This page covers how to get help with Sudoku Duel, the most common questions players ask, and how to delete your data.

Contact

For bug reports, feature requests, or any other question, email perrerscode+support@gmail.com. We aim to reply within 3 business days.

When reporting a bug, please include:

Your device model and OS version (e.g. Pixel 8, Android 15)
The app version, shown at Settings → About
What you were doing when the issue happened, and what you expected vs. what happened

Frequently asked questions

I lost my streak / stats / saved game. Can you restore them?

All progress is stored only on your device — there are no accounts and no cloud sync in this version. If you reinstall the app, switch devices, or tap Settings → Delete all data, that progress is gone and cannot be recovered. Cloud sync is on the roadmap for a future release.

My friend can't join my Battle room.

Battle rooms use a 4-character code that expires after about 10 minutes of inactivity. Make sure both players:

Are on the latest version of the app
Have a stable internet connection (WiFi or cellular)
Are typing the code exactly as shown — the codes are case-insensitive but characters like 0/O are distinct

If the room expired, just create a new one from the Battle screen.

The puzzle won't load / the app crashed.

Solo and Daily puzzles work fully offline. If a puzzle won't load, try force-quitting and reopening the app. If the crash persists, please email us with the steps to reproduce it.

How do I turn notifications on or off?

Open Settings → Notifications inside the app. You can toggle the daily streak reminder (7pm) and the daily-challenge nudge (6am) independently. Both are off by default and stored only on your device.

Why does today's Daily Challenge look the same as my friend's?

That's by design — every player gets the same puzzle each day at each difficulty, so you can compare times. The puzzle changes at local midnight.

How do I report a bug or suggest a feature?

Email perrerscode+support@gmail.com. We read every message.

Deleting your data

Quickest path: open the app, tap Settings → Delete all data, confirm. Everything below happens automatically.

The in-app "Delete all data" button wipes all of the following from your device and is irreversible:

Your nickname
All statistics (best times, games played, win streaks)
Any saved/in-progress solo or daily game
Any Battle (VS) room state
Your onboarding-completion flag — so the welcome tour shows again next launch
Your notification preferences (any scheduled reminders are cancelled)

Data on our servers is minimal and short-lived:

Battle rooms are stored in a Cloudflare Durable Object only for the duration of the room (typically minutes; never longer than 1 hour) and are automatically discarded when the room closes. Nothing about a Battle round persists past room end.
Analytics events (PostHog) are aggregate and not linked to your identity. To request deletion of historical events tied to your device, email us with the device ID shown at Settings → About. We respond within 30 days.
Crash diagnostics (Sentry) are deleted automatically after 90 days, or sooner on request via the email above.

You do not need an account to delete your data — there is no account to delete in the first place. If you simply uninstall the app, all on-device data is removed by the operating system.

Privacy & legal

For details on what data the app collects, how it's used, and your rights under GDPR and CCPA, see our Privacy Policy.