Terms of Service

Last updated: September 9, 2026

These Terms of Service ("Terms") govern your access to and use of the Nitta Quiz mobile application, our website, and related services (collectively, the "Service") provided by Nitta Quiz ("we", "us", "our").

By creating an account, downloading the App, or otherwise using the Service, you agree to these Terms. If you do not agree, do not use the Service.

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1. Eligibility

You must be at least 13 years old and meet any higher minimum age required in your country to use the Service. Selecting a sign-in option on the welcome screen confirms that you meet this requirement. This confirmation is a self-declaration, and we do not verify your age through that screen. By creating an account, you also represent that you have the legal capacity to enter into these Terms. If you are under the age of majority in your country, you must have a parent or legal guardian's consent.

2. Your account

2.1 Sign-in and security

You can sign in with a 6-digit email code, Google, or Apple, using the options available in the App. Email sign-in does not require a Nitta Quiz password. Keep your email and identity-provider accounts secure: someone who can access them may be able to sign in to your Nitta Quiz account. Our Privacy Policy explains the information used for authentication.

2.2 Account information

You agree to provide accurate information (such as your username and country) and to keep it up to date in Settings → Account settings. You are responsible for all activity under your account, including content you post and the friend requests and duel challenges you send.

2.3 One account per person

You may not create multiple accounts to gain unfair advantages, ranking inflation, or duplicate rewards.

2.4 Account deletion

You may request account deletion in Settings → Account settings → Danger zone → Delete account, or from our account deletion page. Your request starts a 15-day recovery window. To cancel during that window, sign back into the App and choose Keep my account. Signing in alone does not cancel deletion.

After the recovery window ends, your account becomes eligible for permanent deletion. Processing runs hourly and can take longer if an error or a required cleanup step delays completion. The date shown in the App is the eligibility date, not a guarantee of completion at that moment. Once deletion completes, you cannot restore your account, progress, history, achievements, badges, or unspent in-game currency. The Privacy Policy explains which records can remain after deletion.

Save the private deletion-status link offered when you request deletion before signing out. The link lets you check progress without signing in and shows completion only after deletion finishes. Anyone with the link can view its status. A completed or cancelled receipt expires after 30 days. We do not send a deletion-completion email.

3. License to use the Service

Subject to these Terms, we grant you a limited, personal, non-exclusive, non-transferable, non-sublicensable, revocable license to download and use the App on devices you own or control, solely for personal, non-commercial entertainment.

4. Acceptable use

You agree not to:

• Cheat, exploit bugs, or use bots, scripts, or third-party tools that interact with the Service in ways not provided by the App's user interface.
• Tamper with the App's binary, network traffic, or local data; reverse-engineer except to the limited extent allowed by law.
• Use the Service to harass, threaten, defame, or harm others, including via your username, profile photo, or bio, or by sending unwanted friend requests or duel challenges.
• Manipulate duels, leaderboards, or other competitive features, for example by colluding, intentionally abandoning matches, or using more than one account to inflate results.
• Upload content that is unlawful, infringing, obscene, hateful, or that violates third-party rights.
• Submit content (in your name, bio, or avatar) that contains personal data of others without their consent.
• Sell, trade, or transfer your account, in-game currency (crowns, gems), items, or rewards outside the Service.
• Probe, scan, or test the vulnerability of the Service, or attempt to bypass authentication, rate limits, security, or feature gating (including feature flags).
• Use automated means to scrape, crawl, or extract data from the Service.

We may suspend or terminate accounts that violate these rules without prior notice.

5. User content

You may submit content to the Service such as your username, profile photo, and short bio. You retain ownership of your content. By submitting it, you grant us a worldwide, non-exclusive, royalty-free license to host, display, and use that content as needed to operate the Service (for example, showing your username and avatar on leaderboards, on your public profile page, and to your friends).

You represent that your content does not violate the law or third-party rights and complies with Section 4.

Profile content can become public before a moderator reviews it. We may remove content that we believe violates these Terms, and we may refuse to display content that, in our reasonable judgment, is inappropriate. We may also restrict changes to a username, profile photo, or bio. A profile restriction does not by itself disable sign-in or gameplay.

You can report a user from their profile or leaderboard actions. To ask us to review a moderation decision, use Settings → Send feedback or email support@nittaquiz.com.

6. The in-game economy

6.1 Lives, gems, and crowns

The Service uses three in-game systems:

• Lives are consumed when you answer questions incorrectly. Lives refill over time, can be earned by watching a rewarded ad, or refilled with gems.
• Gems are an in-game currency used to refill lives, buy boosters, and obtain other items. You can earn gems in the Service, including through eligible rewarded-ad offers. Gems cannot be purchased with real money in this release.
• Crowns are earned through gameplay and used to compete on the leaderboard. Crowns are not redeemable for cash and are not purchasable.

6.2 No real-world value

Gems, crowns, lives, boosters, and other in-game items are licensed to you for personal use. They have no monetary value, are not transferable outside the Service, cannot be exchanged for real money, and cannot be redeemed for goods or services outside the Service. We may modify, regulate, or remove items and currencies at any time at our sole discretion (for example, balance changes for fairness or fraud prevention).

6.3 Daily check-ins, streaks, and rewards

Daily check-in rewards must be claimed within the period shown in the App. Streaks use calendar days in your local time zone and qualifying completed gameplay. Missing a day can end a streak unless a protection or recovery option applies. The App shows the available rewards, requirements, and recovery options. We may run limited-time promotions and adjust their availability without notice.

7. In-app purchases and subscriptions

This release does not offer real-money purchases or subscriptions. Starter Pack, Nitta Unlimited, paid gem packs, and paid ad removal are unavailable. Exchanges using earned gems are part of the in-game economy described in Section 6.

8. Advertising

The App is supported by banner, interstitial, and rewarded ads, such as an offer to watch an ad for a life or gems. Rewarded ads are optional. Ad availability and the reward requirements appear in the App. Advertising requests depend on the consent and tracking choices described in our Privacy Policy. Accepting these Terms does not replace an advertising-consent or device-permission choice.

9. Leaderboards, duels, and social features

Leaderboards display public information about other users (username, avatar, score).

Friends. You can add friends by sharing your public profile link (nittaquiz.com/profile/<username>), by searching for a username inside the App, or by accepting a friend request. You can remove or block other users. Blocking removes the friendship, cancels pending friend requests, and prevents new friend requests and 1-versus-1 duel challenges in either direction. It also hides each user from the other's signed-in friend search and profile previews. Identities can still appear in rankings and game history, and blocking does not remove existing multiplayer memberships. Unblocking removes your block without restoring the friendship. A block set by the other user remains until they remove it. You can manage your block list in Settings → Blocked users. We apply rate limits to friend requests and duels to prevent abuse.

Duels are real-time 1-versus-1 matches between friends: both players answer the same set of questions, and the winner is decided by score and then by speed. You may decline a challenge, and you may surrender a duel in progress. Surrendering or abandoning a match may count as a loss.

We may reset or recalculate leaderboards and duel results to remove cheating, fraud, or technical errors, and we may exclude or remove accounts that violate these Terms.

10. Feature availability and changes

The Service evolves. We may add, modify, suspend, or remove features (for example, ranking, missions, or specific quizzes) at any time. Some features may not be available to all users at all times. We are not liable for features that are unavailable, removed, or changed.

11. Beta features

We may label some features as "beta", "preview", or "coming soon". These are provided "as is", without warranty, and may change or be removed at any time.

12. Intellectual property

The Service, including the App, the Site, the brand, the question content we author or curate, designs, audio, graphics, and code, is owned by us or our licensors and is protected by copyright, trademark, and other laws. Except for the limited license in Section 3 and the rights granted by law, no rights are transferred to you.

If you believe content on the Service infringes your copyright, send a notice to support@nittaquiz.com containing the information required by the Digital Millennium Copyright Act (DMCA) or your local equivalent.

13. Third-party services

The Service uses Apple App Store and Google Play for distribution, Apple and Google for optional social sign-in, Supabase for authentication, database, and storage, Expo with APNs or FCM for push delivery, Google AdMob for ads, Sentry for crash reporting, and Vercel for the website. Your use of those services may be subject to their separate terms and privacy policies. Our Privacy Policy describes their roles in handling information.

14. Termination

We may suspend or terminate your access to the Service at any time, with or without notice, if we believe you have violated these Terms, engaged in fraud, abused the in-game economy, or otherwise put the Service or other users at risk. You may terminate your account at any time by deleting it in Settings.

Upon termination, your license to use the Service ends immediately. Sections that by their nature should survive termination (for example, Sections 6, 12, 15, 16, 17, 18) survive.

15. Disclaimers

THE SERVICE IS PROVIDED "AS IS" AND "AS AVAILABLE", WITHOUT WARRANTIES OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND NON-INFRINGEMENT. WE DO NOT WARRANT THAT THE SERVICE WILL BE UNINTERRUPTED, ERROR-FREE, OR SECURE, OR THAT IT WILL MEET YOUR EXPECTATIONS. SOME JURISDICTIONS DO NOT ALLOW THE EXCLUSION OF CERTAIN WARRANTIES, SO SOME OF THE ABOVE EXCLUSIONS MAY NOT APPLY TO YOU.

16. Limitation of liability

TO THE MAXIMUM EXTENT PERMITTED BY LAW, NITTA AND ITS AFFILIATES, OFFICERS, DIRECTORS, EMPLOYEES, AND AGENTS WILL NOT BE LIABLE FOR ANY INDIRECT, INCIDENTAL, SPECIAL, CONSEQUENTIAL, OR PUNITIVE DAMAGES, OR ANY LOSS OF PROFITS, REVENUE, DATA, OR IN-GAME ITEMS, WHETHER INCURRED DIRECTLY OR INDIRECTLY.

OUR TOTAL LIABILITY FOR ANY CLAIM ARISING OUT OF OR RELATING TO THE SERVICE IS LIMITED TO THE GREATER OF (A) THE AMOUNT YOU PAID NITTA IN THE 12 MONTHS BEFORE THE CLAIM AROSE OR (B) USD $50.

NOTHING IN THESE TERMS LIMITS LIABILITY THAT CANNOT BE LIMITED UNDER APPLICABLE LAW (FOR EXAMPLE, FOR GROSS NEGLIGENCE, WILFUL MISCONDUCT, FRAUD, OR DEATH OR PERSONAL INJURY CAUSED BY OUR NEGLIGENCE).

17. Indemnity

You agree to defend, indemnify, and hold harmless us and our affiliates from and against any claims, damages, liabilities, costs, and expenses (including reasonable attorneys' fees) arising out of (a) your use of the Service, (b) your violation of these Terms, (c) your content, or (d) your violation of any law or third-party right.

18. Governing law and dispute resolution

These Terms are governed by the laws of the jurisdiction in which we are established, without regard to conflict-of-laws principles. The competent courts of that jurisdiction have exclusive authority over disputes arising out of or relating to these Terms, except that consumers may bring claims in the courts of their own country where required by law.

If you reside in the EU, nothing in this Section deprives you of the protection of mandatory consumer-law provisions of your country of residence.

19. Apple-specific terms

If you use the App on iOS:

• These Terms are between you and us, not Apple. Apple is not responsible for the App or its content.
• Apple has no obligation to provide maintenance or support.
• If the App fails to conform to any applicable warranty, you may notify Apple, and Apple will refund the purchase price; to the maximum extent permitted by law, Apple has no other warranty obligation with respect to the App.
• Apple and its subsidiaries are third-party beneficiaries of these Terms and may enforce them.

20. Changes to these Terms

We may update these Terms from time to time. When we do, we will revise the "Last updated" date and, for material changes, notify you in the App or by email at least 30 days before they take effect. Continued use of the Service after that date constitutes acceptance.

21. Miscellaneous

• Entire agreement. These Terms (together with the Privacy Policy and any in-app notices) are the entire agreement between you and us regarding the Service.
• Severability. If any provision is held unenforceable, the remaining provisions remain in effect.
• No waiver. Our failure to enforce any provision is not a waiver.
• Assignment. You may not assign these Terms; we may assign them in connection with a merger, acquisition, or sale of assets.
• Notices. We may give notice through the App, the Site, or your email on file.

22. Contact

• Email: support@nittaquiz.com
• In-app: Settings → Send feedback