Terms of Use

Last updated: 6 November 2026

These Terms of Use apply to the Riddle Mind mobile game (the “App”) and the related website (together, the “Service”). Please read them before you play. By using the Service, you agree to these Terms.

1. Provider

The Service is provided by:

2. Who can play

• Riddle Mind is meant for players aged 13 and over. When you first open the App, we ask for your birth year. Players under 13 cannot use the App.
• Some stories deal with crime, death and other dark topics, told without graphic detail.
• If you are under 18, please ask a parent or guardian before making a purchase.

3. How the game works

Each story describes an unusual situation. You solve it by asking questions that the game’s AI answers with Yes, No or Not relevant. You can open hints and, when you think you know what happened, submit your solution for the AI to check.

Each question or solution you send to the AI counts as one request. A single question can be up to 100 characters long. New stories are added regularly, usually at the start of each month.

4. Free play and ads

• You can download and play Riddle Mind for free. The free version is funded by short rewarded video ads.
• As a free player, you watch one ad to start a story, one ad to open a hint, and one ad for each new set of 25 questions. You always start an ad yourself with a tap; ads never pop up on their own, and there are no banner ads.
• The App shows how many questions you have left before you need to watch the next ad.
• Rewards are unlocked after the ad has been watched to the end and confirmed by the ad provider. If an ad fails to load or isn’t completed, nothing is unlocked and you can try again.
• If you don’t want to watch ads, you can buy Riddle Mind Premium (see section 5).

5. Riddle Mind Premium

Riddle Mind Premium is a one-time purchase. It is not a subscription and never renews or charges you again. Premium includes:

• 10,000 AI requests to use across all stories and replays. This allowance is for the lifetime of your Premium purchase and does not renew monthly or yearly. Both questions and solution submissions count as requests.
• No ads to start stories or for each set of 25 questions while you have Premium requests left.
• Hints without ads, permanently, even after your 10,000 requests are used up.
• A counter in the App’s settings showing your remaining requests. The App warns you before they run out.

When your 10,000 requests are used up, your Premium purchase stays active. You keep ad-free hints and can get more requests by choosing to watch rewarded ads (25 requests per ad).

Premium is linked to the Google Play account used for the purchase. If you reinstall the App, change devices or delete your data, you can restore Premium with Restore purchase in the App’s settings. Your remaining request balance is linked to your purchase. Deleting your data or reinstalling the App does not reset it: restoring Premium brings back the balance you had left, not a new set of 10,000 requests.

The price is shown in the store before you buy and may vary by country and currency.

6. Payment, refunds and withdrawal

Purchases are processed by Google Play. Google’s terms and refund policies apply to payment, billing and refunds. To request a refund, please use Google Play’s refund process. If you have a problem with Premium, you can also email us and we will try to help.

Right of withdrawal: If you are a consumer in the EU, you generally have a 14-day right of withdrawal for online purchases. For digital content such as Premium, this right ends once the content is made available to you, if you have expressly agreed to immediate delivery and confirmed that you lose your right of withdrawal as a result. This confirmation is part of the purchase process. Your statutory rights in case of defects are not affected.

7. AI answers and story content

• The game’s answers are generated by artificial intelligence. They are usually accurate but can occasionally be wrong or inconsistent. If an answer seems wrong or inappropriate, please use the Report button in the App.
• Many stories are inspired by real events. They are simplified and dramatized for the game and are meant as entertainment, not as historical, scientific, medical, legal or other professional advice.
• The AI checks your solution against the story’s answer. Its decision only affects the game.

8. Fair play rules

When using the Service, you must not:

• use bots, scripts or other automated means to send requests,
• try to trick the AI into revealing hidden solutions or ignoring its instructions, or misuse it for purposes unrelated to the game,
• type in content that is illegal, hateful, harassing, sexually explicit or otherwise harmful,
• enter personal information about yourself or other people,
• bypass request limits, ad rewards or purchases, or exploit bugs to gain an advantage,
• reverse engineer, copy or redistribute the App or its content, except where the law allows it,
• interfere with the Service, our servers or other players.

If you break these rules, we may limit or block your access to the Service. Where possible, we will warn you first. Your statutory rights remain unaffected.

9. Intellectual property

The App and all its content, including the stories, hints, solutions, illustrations, logos, sounds and the Riddle Mind name, are protected by copyright and other laws. We grant you a personal, non-exclusive, non-transferable right to use the App for your own private, non-commercial entertainment. All other rights are reserved.

10. Availability and changes

We work hard to keep Riddle Mind running smoothly, but we can’t guarantee that the Service is always available or free of errors. Maintenance, technical problems or services we depend on (such as the AI provider or app stores) can cause interruptions.

We may improve the game, add or change stories and features, and adjust free request limits. We will not reduce the requests included in a Premium purchase you have already made, or remove its ad-free hints. If we ever have to shut down the Service, we will announce it in the App at least 30 days in advance.

11. Your data and deleting it

Riddle Mind works without an account. Your progress is linked to an anonymous player ID. How we handle your data is explained in our Privacy Policy. You can delete your data at any time under Settings → Privacy & Legal → Delete my data. This resets your progress. Premium can be restored afterwards as described in section 5.

12. Liability

We are liable without limitation for damage caused intentionally or through gross negligence, for injury to life, body or health, under the German Product Liability Act, and where we have given a guarantee.

For slight negligence, we are only liable if we breach an essential obligation, meaning an obligation that makes proper performance of the contract possible in the first place and on which you can regularly rely. In that case, our liability is limited to the typical, foreseeable damage. Otherwise, liability for slight negligence is excluded.

13. Changes to these Terms

We may update these Terms, for example when we add features or when the law changes. We will tell you about important changes in the App before they take effect. If a change affects your rights or obligations, we will ask you to accept the new Terms in the App. The current version is always available on this page.

14. Applicable law and disputes

These Terms are governed by the laws of the Federal Republic of Germany. If you are a consumer, this choice of law does not deprive you of the protection of the mandatory laws of the country where you live.

We are not obliged and not willing to take part in dispute resolution proceedings before a consumer arbitration board. If you have a problem, please contact us first. We are happy to find a solution.

If any provision of these Terms is invalid, the rest of the Terms remain valid.

15. Contact

Questions about these Terms? Email us at playriddlemind@gmail.com.