Terms of Use

These Terms of Use (“Terms”) govern your use of Muzukashii (the “App”), a Sudoku game developed by Tamas Bereczki (“we”, “us”, “our”). By downloading, installing or using the App you agree to these Terms and to our Privacy Policy. If you don’t agree, don’t install the App.

1. License

We grant you a personal, non-transferable, non-exclusive, revocable license to install and use the App on Apple-branded devices you own or control, for non-commercial use, as permitted by these Terms and by Apple’s Licensed Application End User License Agreement (apple.com/legal/internet-services/itunes/dev/stdeula). Where Apple’s Licensed Application EULA conflicts with these Terms, Apple’s EULA prevails for matters it covers (warranty, product claims, IP claims, and so on); these Terms cover everything else.

2. In-App Purchase — Supporter Edition

The App offers a single one-time non-consumable in-app purchase called the Supporter Edition. The Supporter Edition is optional; the core game — every puzzle, the Daily Challenge, Game Center, iCloud sync — is fully playable without it. The Supporter Edition unlocks:

• The Appearance picker (System / Light / Dark dark-mode support).
• An alternate app icon, with a toggle to keep the default icon if preferred.
• A custom splash artwork when present in the bundled assets (graceful fall-back to the default splash otherwise).
• A “Supporter Edition” badge on the main menu.

Price. The price is shown in your local currency on the purchase confirmation sheet that Apple presents. Taxes are added by Apple per your App Store country.

Processing. The transaction is processed by Apple through StoreKit. Your payment will be charged to your Apple ID account at confirmation. We never see your payment information.

Restore. The Supporter Edition entitlement is tied to your Apple ID. Use Settings → Restore Purchases in the App to restore it on another device signed in to the same Apple ID, or after reinstalling. The entitlement also restores automatically on first launch where possible.

Family Sharing. The Supporter Edition is enabled for Family Sharing, where supported by the App Store in your region.

Refunds. All refund requests are handled by Apple under the App Store’s policy. Submit refund requests at reportaproblem.apple.com. We are not able to issue refunds ourselves, except where mandatory consumer law requires us to.

EU / EEA / UK right of withdrawal. If you are a consumer in the EU, EEA or UK, you normally have a 14-day right to withdraw from a distance contract for digital content. By confirming the purchase in the StoreKit dialog, you (i) request that we begin supplying the Supporter Edition immediately and (ii) acknowledge that you therefore lose your right of withdrawal once delivery has begun, in accordance with Article 16(m) of Directive 2011/83/EU (and equivalent national implementations). Apple’s refund process remains available as a goodwill channel even after this point, and any mandatory statutory remedies in your country of residence are unaffected.

If the entitlement is later revoked — for example after a refund, family removal, or chargeback — the Supporter perks are removed, but your dark-mode and alternate-icon preferences are preserved so the choice springs back to life if the entitlement returns.

No subscription. The Supporter Edition is not a subscription. It is a one-time purchase. There are no consumable or auto-renewing items in the App.

3. Game Center, leaderboards & achievements

If you sign in to Game Center, the App submits scores and achievements per the Privacy Policy. To keep leaderboards meaningful:

• The App applies plausibility floors and ceilings (Ichi ≥ 30s, Ni ≥ 60s, San ≥ 90s, all runs < 7 days), excludes Zen-Mode and incomplete runs, and deduplicates per run.
• We reserve the right to remove or refuse to submit scores or achievement progress that we reasonably believe were obtained through automation, a modified client, or any other circumvention of the in-app anti-cheat checks. We do not “ban” — we simply don’t accept the score.
• Daily Challenge leaderboard entries only accept the run for today’s puzzle; archived or backfilled Daily Challenges submit only to the relevant difficulty board.

4. Acceptable use

You agree that you will not:

• Decompile, disassemble, or reverse-engineer the App, except to the extent expressly permitted by applicable law (and only after notifying us, where the law requires that).
• Attempt to bypass the Supporter Edition entitlement check, modify the App’s binary, or distribute modified copies.
• Use the App to violate any law, regulation, or third party’s rights.

5. Intellectual property

The App and its content — code, art, music, text, the Koyo theme, the wordmark, and the Sudoku puzzle library bundled with the App — are owned by us or our licensors and are protected by copyright and other laws. The license in §1 does not transfer ownership.

6. Third-party services

The App relies on services provided by Apple — Game Center, iCloud, App Store, StoreKit. Your use of those services is also governed by Apple’s own terms and privacy policy. We are not responsible for the availability or performance of those services.

7. No warranty

The App is provided “as is” and “as available”, without warranties of any kind, whether express, implied, or statutory, to the maximum extent permitted by law. We do not warrant that the App will be uninterrupted, error-free, or that any score or save will be preserved indefinitely. Apple’s Licensed Application EULA covers warranty claims for the binary delivered through the App Store.

8. Limitation of liability

To the maximum extent permitted by law, we will not be liable for any indirect, incidental, consequential, special, exemplary or punitive damages, or for any lost profits, data, or savegames, arising out of or in connection with the App or these Terms, even if advised of the possibility of such damages. Our total aggregate liability for direct damages will not exceed the greater of (a) the amount you paid us for the App in the twelve months preceding the claim, or (b) ten euros.

Nothing in these Terms limits liability that cannot be limited under applicable law — including, in some jurisdictions, liability for death or personal injury caused by negligence, or for fraud.

9. Apple’s role (App Store-specific)

You and we acknowledge that these Terms are between you and us, not Apple, and that Apple is not responsible for the App or its content. Apple has no obligation to provide maintenance or support for the App. In the event of any failure of the App to conform to any applicable warranty, you may notify Apple, and Apple will refund the purchase price (if any) for the App; to the maximum extent permitted by applicable law, Apple has no other warranty obligation. Apple and Apple’s subsidiaries are third-party beneficiaries of these Terms and, upon your acceptance of these Terms, have the right (and will be deemed to have accepted the right) to enforce them against you.

10. Termination

These Terms apply until terminated. You may terminate by deleting the App. We may terminate or suspend your license if you materially breach these Terms. Sections that by their nature should survive (intellectual property, disclaimers, limitation of liability, governing law) survive termination.

11. Changes

We may update these Terms as the App evolves. We’ll update the “Effective date” above when we do. Continued use of the App after a change means you accept the new Terms.

12. Governing law & venue

These Terms are governed by the laws of Romania, without regard to its conflict-of-law rules, and exclusive venue lies with the competent courts of Romania. Where you are a consumer, this choice of law and venue does not deprive you of the protection afforded to you by mandatory provisions of the law of the country in which you are habitually resident (including, for consumers in the EU, the rights under Regulation (EC) 593/2008 (“Rome I”) and applicable consumer-protection directives), and you may also bring proceedings in the courts of your country of residence where the law allows.

EU online dispute resolution. Consumers resident in the EU may use the European Commission’s online dispute-resolution platform at ec.europa.eu/consumers/odr. We are, however, not obliged to and do not currently participate in alternative dispute resolution before a consumer arbitration body.

13. Contact

[email protected].