Privacy policy

How Hasly Game Studio handles information when you play Sudoku Arena or visit this website.

Last updated: September 18, 2026

Who is responsible

Hasly Game Studio operates Sudoku Arena and this website. For privacy questions, requests, or concerns, contact hasly.game.studio@gmail.com.

Information used by the game

• Player accounts: an automatically generated player ID, chosen player name, account and sign-in timestamps, and an email address if you link your player to email. Verification emails are sent when you request account access.
• Game progress: puzzles, entered numbers, notes, elapsed time, mistakes, statistics, earned coins, unlocked themes, and preferences. Solo saves are stored on your device. When you use a linked account, a copy can be stored in the cloud to synchronize devices.
• Online play: room membership, game mode, boards and moves, match progress, connection activity, results, wins, and best times. Other players can see your chosen name and relevant match information; leaderboard entries include player names and scores. Your account email and private solo save are not displayed to other players.
• Purchases: product and transaction identifiers, purchase history, store receipt or purchase-token information, and entitlement status. RevenueCat uses a separate customer identifier to validate purchases, restore access, prevent fraud, and provide purchase reporting. We do not receive your full payment-card details from the store.
• Technical information: our hosting and service providers receive network information such as IP addresses, request timestamps, and information needed to operate and protect their services.

Advertising

The app integrates Google AdMob for banner advertising. Ad-enabled builds may send Google IP addresses (which can indicate approximate location), advertising or other device identifiers, app/ad interactions, and performance information to deliver and measure ads and prevent fraud. The app requests non-personalized ads; this does not mean that no data is processed. Internal test builds use Google's test ad units.

Where required, the app asks for advertising consent before requesting live ads. Where available, use Ad privacy choices below a live banner to revisit your choices. You can also manage the advertising identifier in your device settings. The lifetime ad-free purchase removes banner ads when the store entitlement is verified.

Why we use information

We use information to run the game, authenticate players, deliver verification emails, synchronize saves, enable multiplayer and leaderboards, validate and restore purchases, respond to support requests, and maintain service security. Advertising helps fund the free game. We do not sell player account information for money.

Services that process information

We use the following providers for these functions. Their privacy notices describe their own processing:

• Supabase: account authentication, cloud saves, multiplayer data, and hosting of the game's database. The current game backend is hosted in the United States.
• SMTP2GO: delivery of sign-in and account verification emails, including delivery logs.
• RevenueCat: purchase validation, entitlement management, and purchase reporting.
• Google: Google Play purchases and Google AdMob advertising. Apple handles App Store purchases where offered under Apple's privacy policy.
• Cloudflare: hosting, delivery, and security of this website.

Information may be processed in countries other than your own. We may also disclose information when necessary to comply with applicable law or protect the security and rights of our players and services.

This website and support emails

This website has no account login, advertising scripts, or analytics added by Hasly Game Studio. Cloudflare receives technical request data to serve and protect it and may use security-related cookies. When you email support, we receive your email address, message, and any attachments you choose to send. Please do not send passwords, verification codes, or payment-card details.

Storage, retention, and deletion

Account information, cloud saves, and multiplayer profiles are retained while your account exists so you can return to your game. You can delete your linked account in the app or request deletion by email. Deletion removes the account, its cloud save, and its associated multiplayer profile and membership records from the active game database. Game-room records without your profile may remain until routine cleanup.

Sign-out does not delete your account or its local saves. Deletion from one device cannot remotely erase cached saves on other offline devices; remove app data or uninstall there as well. Store transaction records and RevenueCat purchase records are managed separately from the game account. Contact us if your request includes purchase-related personal information. Records needed for legal, accounting, fraud-prevention, or security purposes may be retained as required; service logs and backups may remain until their normal retention periods expire.

See Delete your account for the available methods and what is removed. We use encrypted connections for online services and restrict access to account data.

Your privacy choices

Depending on your location, you may have rights to access, correct, obtain a copy of, or delete your personal information, object to or restrict certain processing, or withdraw consent. Contact hasly.game.studio@gmail.com to make a request. We may ask for information needed to verify that you own the account. You may also contact your local data protection authority.

Children and family use

If you are a parent or guardian and believe a child has provided personal information without the required permission, contact us so we can investigate and remove it where appropriate. Please avoid using real names or other personal information as public player names.

Changes to this policy

We will update this page when our data practices change and revise the date above. Where required, we will provide additional notice or ask for consent before a material change takes effect.