Privacy policy
Effective 16 October 2026 for MATHOJI and mathoji.com. Published by Mathoji.com. Contact [email protected] for privacy questions.
Play without an account
MATHOJI does not require a player login. Playing does not create a guest, Google or Apple account. Optional remote announcements use a separate anonymous notification identity, described below. Puzzle inputs, answers, attempts, completion times, hints, streaks, history and preferences are saved on your device or in your current browser. The mobile app does not upload your puzzle performance. The website sends limited usage events only if you allow optional analytics, as described below. Neither provides account sync, public leaderboards or account profiles.
Existing puzzle saves already on the device are carried forward where available. We do not download earlier cloud saves. Each device and browser has its own progress. Clearing app or browser storage, uninstalling, or using private browsing can remove saves. Your operating system’s backup and restore settings may also affect local app data; MATHOJI does not provide a cloud backup service.
Daily puzzles and service connections
Firebase provides published puzzles, website hosting and optional service configuration. These network connections may involve IP addresses, technical logs and app-installation identifiers used by service providers to operate and secure their services. Firebase Authentication is used only if you enable remote announcements, to protect your notification registration. The mobile app does not include Firebase Analytics. The website’s optional analytics is described below.
Contacts and invitations
Contact access is optional. On mobile, we request permission before reading available contact names and phone numbers; limited access is respected. There is no Google Contacts or email import. Contacts and selected recipients stay in the invitation screen’s memory and are not saved in game storage, uploaded to MATHOJI or supplied to advertising.
You can enter numbers manually or revoke contact access in device Settings. Only selected recipients and invitation text are passed to Messages, WhatsApp or another sharing app when you choose to share. You confirm Send in that app. Group SMS recipients may see one another’s numbers; we explain this before opening the composer. Messaging services operate under their own policies. We do not record whether you send an invitation.
Local reminders
Notifications are optional. If enabled, the app schedules puzzle and streak reminders on your device using its time zone. Local reminders alone do not register a push token with MATHOJI. Turn reminders off in MATHOJI Settings or revoke notification permission in device Settings. We do not collect precise location.
Optional game announcements
Game announcements are off by default and have a separate switch in Settings. If you enable them and allow device notification permission, Firebase Cloud Messaging registers a push token. We store that token, an anonymous installation-specific user ID, the iOS or Android platform, your enabled preference and an update timestamp in MATHOJI’s Firebase project to deliver announcements. This identity is separate from earlier player accounts; it is not used to upload game progress, contacts or advertising data.
Turn Game announcements off to stop token creation and request removal of the registration and its anonymous identity. If the device is offline, cleanup retries when the app next opens online. Device notification Settings can block alerts immediately. Provider security logs and backups can have separate retention periods. Reinstalling or restoring a device may create a new registration. This feature does not provide game sync or a player profile.
Optional website analytics
Website analytics is off by default. If you choose Allow analytics in Privacy choices, we load Google Analytics for Mathoji’s existing web property. It records page visits, returning browser visits, puzzle starts and completions, archive use and selected reading interactions. It uses first-party analytics cookies and processes browser/device information, approximate location and network information. We do not send your typed answers, contact details, recipient lists, names, email addresses or a player account ID. These events are used to improve the game and website, not to create a public leaderboard or cloud save.
The analytics cookie is configured to expire after 90 days without a refresh. Your consent choice is stored in this browser for up to 180 days. You can withdraw at any time using Privacy choices in the footer; we stop sending new analytics events and request removal of accessible first-party analytics cookies. Withdrawal does not erase information already processed by Google. The property’s separate retention settings govern retained events. Contact [email protected] for related questions. Rejecting analytics does not prevent play or local saving.
We use a basic opt-in implementation: the Google Analytics tag is not loaded before permission. Browser Global Privacy Control or Do Not Track signals disable our optional analytics. These controls are separate from Google AdSense advertising consent. Google Analytics may process data outside your country. See Google’s privacy policy.
Advertising
Mobile apps use Google AdMob and its consent tools. Optional rewarded ads can earn hints or reveals. The website uses Google AdSense display advertising; web hints and reveals are free. Ad clicks never grant rewards. Advertising services may process device or browser identifiers, IP address, approximate location, ad interactions, diagnostic and app-performance information and use cookies or similar technologies, subject to applicable consent choices. Local puzzle saving does not mean advertising services collect no data.
Native advertising privacy choices are available in Settings where supported. Browser users can use Advertising privacy choices in the footer where Google’s consent message is available, browser cookie controls and My Ad Center. See Google’s privacy policy and advertising information. Contact lists are never shared with ads.
Delete device performance
Choose Settings → Delete Performance Data Saved on Your Device and confirm. This clears saved games, unfinished puzzles, attempts, completion history and streaks, including legacy account saves held locally. Preferences and downloaded puzzle content remain. It cannot be undone. Each other device or browser must be cleared separately.
Accounts from earlier releases
Earlier versions used Firebase guest, Google or Apple accounts, cloud game records, device registrations and optional public rankings. Removing login from the new release does not automatically erase those existing server records. For access, correction or deletion of earlier cloud data, contact [email protected]; we will verify ownership before acting. Never send passwords or access tokens. See data deletion help. Provider logs, backups and aggregated statistics may have separate retention processes.
Service providers and security
Google and messaging providers may process data outside your country, including in the United States. We use encrypted service connections and access controls; no storage or network is completely secure. Data you supply when contacting support is used to respond to your request. We do not sell contact lists.
Children and changes
MATHOJI is intended for a general audience and is not directed to children under 13. Contact us if you believe a child has provided personal data without appropriate permission. We may update this policy when features change; the effective date identifies this version.