Terms of use

Last updated: 17.10.2026

1. Provider, scope and conclusion of contract

These terms govern the use of the DenkArena app and its online features. The provider is Erdi Karasungur, Bieberer Str. 52, 63065 Offenbach am Main, Germany, email: support@denkarena.com. A contract of use on these terms is concluded when you agree in the app, or at the latest when you use it. Users' own terms do not apply.

2. Minimum age

You may use the app from the age of 13. If you are not yet of legal age, you need the consent of your parents or guardians for an account, purchases and the online features.

3. Services and availability

DenkArena offers puzzle games for free with ads. Premium removes ads and unlocks additional content. We provide free features voluntarily and may change, extend, limit or discontinue them, in particular for technical, legal or economic reasons. Online features (e.g. online chess, leagues, the weekly leaderboard, the shop, community levels, account backup) require an internet connection and use third-party services. We aim for availability with as few interruptions as possible but cannot guarantee it; maintenance, disruptions and outages may occur. We only change Premium services for a valid reason, at no extra cost to you and with timely notice; your statutory rights for digital products remain unaffected.

4. Account

An account is optional and is created with your email address and a one-time code. Keep access to your mailbox secure; you are responsible for actions taken through your account to the extent you are at fault. Only one account per person is allowed for the weekly leaderboard and leagues. You can delete your account at any time in the settings; your progress, points and items are then deleted irrevocably. You cancel a running subscription separately in the store.

5. Premium subscription

The subscription is purchased and billed via the App Store or Google Play. The price shown by the store at the time of purchase applies. It renews automatically for the chosen period unless cancelled in the store settings at least 24 hours before it ends. After cancelling, Premium stays active until the end of the paid period. Withdrawal and refunds are governed by law and the rules of the respective store. For digital content, the right of withdrawal may expire early if you agree to immediate provision and confirm that you thereby lose your right of withdrawal. The store announces price changes.

6. Points, virtual items and corrections

Points, titles, avatars, frames, boards, jokers and other items are virtual content. You receive a simple, non-transferable right to use them in the app, but no ownership. They have no monetary value and cannot be exchanged for money or other services, sold, given away or transferred to other accounts. If points or items were credited due to a software bug, miscalculation, transmission error or manipulation, we may correct or remove them; this also applies to prizes and placings based on them. If we discontinue free features, there is no claim to keep or replace virtual content received for free.

7. Weekly leaderboard, leagues and prizes

Taking part is free and requires no stake; it is not a sweepstake or game of chance. Prizes are exclusively virtual content within the meaning of section 6; payout, exchange or replacement in money is excluded. Points and placings shown are provisional until the week has ended and been evaluated. We may exclude players from the ranking and withdraw placings and prizes if they breach these terms, for example through manipulation, exploiting bugs, multiple accounts or arranged results. We may correct errors in calculation or awarding. We may change rules, points, prizes and periods for future weeks and suspend the leaderboard entirely or temporarily. There is no claim to a particular placing or prize.

8. Names, profiles and reports

Display names, league names and profile details must not be offensive, discriminatory, sexual, glorify violence, be extremist, promotional or misleading, must not infringe third-party rights (e.g. trademark or name rights) and must not suggest that you belong to the DenkArena team. Other players can report names. We may reset or change inadmissible names at any time. Points spent on a name change are not refunded if the name is reset because of a violation. Abusive reports are also a violation.

9. Your own content (community levels)

When you publish a level, you grant us the simple, royalty-free, unlimited right to show it in the app and make it available to other players. Only publish levels you built yourself and that do not infringe third-party rights. If we are accused of an infringement caused by your content for which you are responsible, you indemnify us against justified third-party claims, including reasonable legal defence costs. We may hide or delete content without giving reasons, in particular after reports.

10. Fair play and consequences of violations

In particular, you may not modify or copy the app or circumvent technical protection measures, exploit bugs, use bots or automated input, falsify results, use multiple accounts for your own advantage, harass other players or interfere with our servers. Please report bugs via “Send feedback” instead of exploiting them. Depending on the severity, we may issue a warning, reset names, remove results, points, items and placings, exclude you from online features or suspend the account temporarily or permanently, in serious cases without prior warning. We take your legitimate interests into account; you can contact us by email at any time. If your account is suspended, there is no claim to the stored progress; your statutory rights regarding paid Premium remain unaffected.

11. Content, errors and mistakes

We create and check puzzles, solutions, explanations, translations and texts with care. Nevertheless, errors may occur, such as faulty or ambiguous puzzles, calculation or display errors, and spelling or translation mistakes. We give no warranty that free content is error-free; statutory rights apply to Premium. We fix reported errors within a reasonable time. Obvious errors in information shown in the app, such as point prices, descriptions or credits, are not binding; errors excepted. Ratings, statistics, estimated waiting times and leaderboards are non-binding information.

12. Advertising and third-party offers

Ads come from Google AdMob and its advertising partners. The respective providers are solely responsible for the content of the ads and the advertised offers. Contracts you conclude via an ad are concluded only between you and the advertiser.

13. Liability

We are liable without limitation for intent and 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 for breach of essential contractual obligations, i.e. obligations whose fulfilment makes the use of the app possible in the first place and on whose observance you may regularly rely, and limited to the foreseeable damage typical for the contract. Otherwise, liability for slight negligence is excluded. Where we provide services free of charge, we are only liable for intent and gross negligence, except for injury to life, body or health. For the loss of game progress, we are only liable to the extent that it would also have occurred if the offered account backup had been used. These rules also apply to our vicarious agents. Mandatory statutory rights, in particular as a consumer, remain unaffected.

14. Term and termination

The contract of use runs for an indefinite period. You can end it at any time by no longer using the app and deleting your account. We may terminate the contract for free services with four weeks' notice, for example if we discontinue the app, and without notice for good cause, for example in case of serious violations. Paid Premium periods are handled according to the statutory rules.

15. Changes to these terms

We may change these terms with effect for the future if there is a valid reason, such as new features, changes in law or case law, or protection against abuse, and you are not unreasonably disadvantaged. We will inform you about changes in the app and ask for your consent. If you do not agree, you can continue to use the app without the affected online features or end the contract.

16. Final provisions

German law applies, excluding the UN Convention on Contracts for the International Sale of Goods; mandatory consumer protection rules of your country of residence remain unaffected. The contract language is German; translations are provided for convenience, and in case of discrepancies the German version prevails to the extent permitted by law. We are neither obliged nor willing to take part in dispute resolution proceedings before a consumer arbitration board. If a provision is invalid, the remaining provisions remain valid; the statutory provision replaces the invalid one.