Sudoku Throne — Terms of Use

Effective: September 28, 2026. The Korean version above prevails where the two differ, except where the mandatory law of your country says otherwise.

1. About these terms

These terms govern your use of the mobile game “Sudoku Throne” (the “Service”) provided by IEUMAPPS (이음앱스, the “Company”), a sole proprietorship in the Republic of Korea.

2. Definitions

• Anonymous account: an account the app creates automatically on first launch. No sign-up is needed. Linking a Kakao account is optional.
• Coins: in-game currency earned only by playing (stages, battles, missions, daily check-in) and used only inside the game.
• Gems: in-game currency that you get only by buying gem packs (in-app purchases) or as a one-time bonus with Premium, and can spend only on cosmetics (board, number keys, avatar frame, background, character accessories). Gems from gem packs are “paid gems”; the 200 gems that come with Premium are “bonus gems”.
• Cosmetics: items bought with coins or gems that change only how the game looks. They have no effect on game results.
• Premium (Lifetime): a one-time purchase you keep for as long as the Service is provided.

3. Changes to these terms

We post these terms on this page and in the app (Settings › About › Terms of use). We may update them within the limits of the law and will announce changes on this page at least 7 days in advance (30 days for changes that are material or unfavorable to you). If you do not agree, you may stop using the Service and delete your account.

4. Account and data

• Your adventure progress, battle rankings, friends, achievements and a backup of your coins, XP, gems, characters and owned cosmetics are stored on our server under your anonymous account.
• An anonymous account cannot be found again once you delete the app. If you link a Kakao account, you can sign in with it after reinstalling or on a new device and restore your backed-up data.
• Per-stage records, battle records, equipped cosmetics and settings are stored only on your device and cannot be recovered if you delete the app or change devices.
• Do not sell, lend or share your account.

5. The Service

• Sudoku adventure (countries, stages, thrones), battles (Speed, Item, Cell Race), friend challenges and live friend battles, adventure and season rankings, achievements and badges, character collection.
• Friend challenges and live friend battles are friendly matches and do not count toward season rankings or rewards.
• We may change rules, rewards, season schedules and features to keep the game fair and improve it. We will announce important changes that are unfavorable to you in advance.

6. Coins, gems and other virtual items

• Coins are earned only by playing and cannot be bought. They cannot be exchanged for money or other goods, transferred to other players, and have no monetary value.
• Gems come from gem packs, or as a one-time bonus of 200 gems when you buy Premium. Gems can be spent only on cosmetics. They cannot be converted into coins, hints or any gameplay advantage, and we do not sell randomized (loot box) items.
• Bonus gems are free, so they are not refundable. When you buy a cosmetic, bonus gems are spent first, then paid gems; paid gems are spent in the order they were bought (first in, first out).
• Gems cannot be cashed out or transferred to other players (except for cancellations and refunds under Section 8 and the end-of-service refund below). Cosmetics bought with gems are applied immediately.
• Gems and cosmetics can be used for as long as we provide the Service. If we end the Service:
  • We will announce the end date, how to get a refund and the request period on this page and in the app (notice and push notification) at least 30 days before the end date, and stop selling gem packs and Premium from the day of the announcement.
  • For paid gems left on the end date, we refund, for each purchase those gems belong to, “amount actually paid × remaining gems ÷ gems received in that purchase”, rounded up. We do not deduct store fees or taxes.
  • Refunds go to the original payment method. Where the store does not allow that (e.g. App Store purchases), we transfer the amount to a bank account you give us and delete the account details right after the transfer.
  • The refund desk (support@ieumapp.com) stays open for 6 months after the end date. Later requests are still handled where the purchase and gem records can be verified.
  • Bonus gems, cosmetics already bought with gems, coins and Premium (Lifetime) are not refunded when the Service ends.
• We may take back coins, gems or rewards granted by mistake or obtained by cheating.

7. Premium (Lifetime)

• What you get: no ads, two premium themes and a one-time bonus of 200 gems. We never sell gameplay advantages.
• The bonus gems are granted once, when you first buy Premium. They are not granted again when you restore the purchase after reinstalling or on a new device. If Premium is refunded, the 200 bonus gems are taken back; if your remaining gems are not enough, cosmetics bought with those gems may be removed.
• Price: the amount shown on the store’s payment screen. Payment is processed by Google Play (or the App Store for the iOS version); we never receive your card details.
• This is not a subscription. You pay once and are never charged again.
• “Lifetime” means for as long as we provide the Service; if the Service ends, Premium lasts until the end date (we stop selling it once the end is announced). With the same store account you can restore it after reinstalling or on a new device (Settings › Restore purchase). A purchase made on Google Play cannot be used on the App Store version, and vice versa.

8. Cancellation and refunds

• Gem packs: within 7 days of purchase (or of receiving the gems, if later) you may cancel the part you have not spent. If you spent none of the gems you get a full refund; if you spent some, we refund “amount paid × remaining gems ÷ gems received” and take back the remaining gems. Gems already spent cannot be refunded.
• Premium: because no-ads, the themes and the bonus gems are applied the moment you pay, cancellation is limited. You can still get a refund in the two cases below, or when the store approves one.
• If the content is different from what was described or advertised, you may cancel within 3 months of receiving it, or within 30 days of when you found out (or could have found out).
• Minors: a purchase made by a minor without the consent of a parent or legal guardian may be cancelled by the minor or the guardian (Korean Civil Act, Article 5). This does not apply if the purchase was made with money the guardian allowed the minor to spend, or if the minor pretended to be an adult or to have consent. We judge whether the buyer is a minor from the device, the person who paid and the name on the payment method, and may ask for documents such as proof of family relationship.
• How to request a refund: on Google Play, you can request a refund directly from Google Play within 48 hours of purchase; after that, email support@ieumapp.com with your order number. Refunds we process ourselves are issued within 3 business days of verifying the request. For the App Store version, use Apple’s “Report a Problem” (reportaproblem.apple.com). Refunds are processed under the policies of the store that handled your payment.
• When a purchase is refunded, the Premium benefits (no ads, premium themes and the 200 bonus gems) are removed or taken back, and for a gem pack the refunded gems are taken back. If your remaining gems are not enough, cosmetics bought with those gems may be removed.
• Refunds of paid gems when the Service ends are described in Section 6.
• If you are a consumer in the EEA, the UK or another country with mandatory consumer protection laws, nothing in these terms limits the rights those laws give you.

9. Ads

Free users may see full-screen ads between games (never during a game). Ads are provided by Google AdMob. Where ad consent is required, you can change your choices at any time in Settings › About › Privacy options. See the Privacy Policy.

10. Prohibited conduct

• Cheating: using auto-solvers, macros, modified apps or other unauthorized programs; reverse-engineering or tampering with the app, server or network traffic; knowingly exploiting bugs.
• Ranking or match manipulation: using multiple accounts, losing on purpose, or sending forged records to gain ranks or season rewards.
• Abusive nicknames or behavior: profanity, hate, sexual or discriminatory content; impersonating others or the Company; nicknames containing contact details or other personal information; harassing others with repeated battle requests.
• Using someone else’s account or information, or anything else that breaks the law or public order.

11. Restrictions

If we confirm a violation, depending on its severity we may reset your nickname, remove you from rankings or delete records, take back rewards obtained unfairly, restrict online features (rankings, friends, battles), or delete the account. We will normally notify you first; in urgent cases we may act first and notify you afterwards. To appeal, email support@ieumapp.com.

12. Changes, interruptions and termination of the Service

• The Service may be temporarily unavailable because of maintenance, outages or network problems. The adventure mode keeps working on your device even when online features are down.
• If we end the Service, we will announce it on this page and in the app at least 30 days before the end date.

13. Limitation of liability

• We are not liable for damage caused by events beyond our control, such as natural disasters or outages of network, store or cloud providers.
• Data stored only on your device cannot be recovered if the device is lost or the app is deleted. The server backup of an anonymous account that is not linked to Kakao also cannot be restored once the app is deleted.
• These limits do not apply to damage caused by our intent or gross negligence, or where the law does not allow liability to be limited.

14. Deleting your account

You can delete your account at any time in Settings › Friends & account › Delete account. Your account and records on our server, including the backup of your coins, XP, gems, characters and cosmetics, are deleted immediately and cannot be restored (how to delete). Please check for unspent gems before deleting. Your Premium purchase stays with your store account and can be restored after reinstalling.

15. Governing law and disputes

• If you have a complaint, please email support@ieumapp.com. We will look into it and reply.
• These terms are governed by the laws of the Republic of Korea, without prejudice to the mandatory consumer protection laws of your country of residence. Disputes that go to court will be handled by the competent court under the Korean Civil Procedure Act, unless the law of your country gives you the right to bring proceedings in your local courts.

Business information

Privacy Policy · Account deletion