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These terms cover use of the Game Twin Android app. The app is free; a supporter key is purchased from Sold through Link, LLC as merchant of record (see the Impressum).

Terms of Use (End-User License Agreement)

Last updated: August 2026

This is a translation for convenience. The German version is the legally binding one.

This End-User License Agreement ("Agreement") is a legal agreement between you ("you") and Mert Aslantürk ("Author") for the Game Twin software application, including its executable code, assets and accompanying materials (together, the "Software"). By downloading, installing or using the Software, you agree to be bound by this Agreement. If you do not agree, do not download, install or use the Software.

The Software is distributed free of charge. An optional supporter key, purchased separately, unlocks additional features. This Agreement keeps the two apart throughout: terms written for the free application do not cut down the statutory rights you have as the purchaser of a supporter key.

1. License Grant

Subject to your compliance with this Agreement, the Author grants you a personal, limited, non-exclusive, non-transferable, non-sublicensable, royalty-free license to download, install and use the Software on devices you own or control, solely for your personal, non-commercial use.

For the free application this license is revocable in accordance with Section 9. Where you hold a valid supporter key, the license to the features it unlocks runs for the term and the number of devices you paid for and is not revocable at will.

2. Reservation of Rights

The Software is licensed, not sold. The Author retains all right, title and interest in and to the Software, including all copyright, trademark and other intellectual property rights. All rights not expressly granted to you in this Agreement are reserved by the Author.

3. Restrictions

Except to the extent the following is prohibited by applicable law, you may not:

(a) sell, rent, lease, lend, sublicense, distribute, publish or otherwise make the Software available to any third party;

(b) modify, adapt, translate or create derivative works of the Software;

(d) remove, alter or obscure any copyright, trademark or other proprietary notice in or on the Software;

(e) use the Software for any commercial purpose or to build a competing product or service; or

(f) use the Software in any unlawful manner or in violation of any third party's rights.

Nothing in this Section limits any right you have under sections 69d and 69e UrhG (the German Copyright Act) or other mandatory law; any agreement to the contrary is void under section 69g(2) UrhG.

4. Free Application

The free application is provided as a voluntary service, free of charge. It may change at any time or be discontinued without notice, and the Author does not warrant that it is complete, free of errors or available without interruption.

For the free application the Author has no obligation to provide updates, maintenance or support, or to make the Software generally available.

Where you have purchased a supporter key, your statutory rights for digital products under sections 327 and following of the German Civil Code (BGB), including the conformity requirements and the update obligation, remain unaffected. Nothing in this Section is to be read as reducing them.

5. Privacy and License Validation

To enforce per-device activation limits, the Software transmits the license key, your device model and a hashed device identifier (derived from your Android ID) to the licensing provider (Lemon Squeezy). The Software does not include analytics, advertising or behavioural tracking, and the Author does not sell your data.

The full privacy policy, with the purposes, the legal bases, the recipients, the retention periods and your rights under the GDPR, is available in the Software under Settings, About, Privacy Policy.

6. Third-Party Content and Services

The Software helps you locate and store reference material (such as guides, maps and artwork) that is hosted by third parties and owned by its respective rights holders. The Software does not host, create or redistribute that material. You are solely responsible for complying with the terms of service and applicable law of any third-party site or service you access through the Software. The Software is not affiliated with, endorsed by or sponsored by any such third party.

7. Liability

The Author is liable without limitation for intent and gross negligence, for injury to life, body or health, and under the German Product Liability Act (Produkthaftungsgesetz). In cases of simple negligence the Author is liable only for breach of a material contractual obligation (Kardinalpflicht), meaning an obligation whose fulfilment makes the proper performance of this Agreement possible in the first place and on whose observance you may regularly rely; in that case liability is limited to the foreseeable damage typical for this type of contract. Any further liability is excluded.

The Software may contain errors, lose data or be discontinued; keep backups of anything you cannot afford to lose.

8. Supporter Key and Purchases

The application itself is free of charge. A supporter key is optional and is sold through Lemon Squeezy, which acts as Merchant of Record: the purchase contract is concluded with Lemon Squeezy rather than with the Author, and Lemon Squeezy's own terms and privacy policy apply to it.

The statutory consumer rights for digital products arise in that contractual relationship, in particular the right of withdrawal under section 355 BGB and the update obligation for digital products under section 327f BGB. Where you have expressly consented to performance beginning immediately and confirmed that you thereby lose your right of withdrawal, that right may lapse under section 356(5) BGB.

The Author will assist in giving effect to those rights and can be reached at hello@game-twin.app. Nothing in this Agreement limits them.

9. Termination

This Agreement is effective until terminated. The Author may suspend or end your access to the free application at any time and without giving reasons; your license to the free application ends with it.

A supporter key you have paid for is different: your rights under it end only if you are in material breach of this Agreement and, where the breach can be cured, only if you fail to cure it within a reasonable period after the Author has asked you to. Statutory rights of termination for good cause remain unaffected.

Upon termination you must stop using the Software and delete all copies in your possession or control. Sections 2, 3, 7, 8, 10 and 11 survive termination.

10. Governing Law

This Agreement is governed by the laws of the Federal Republic of Germany, excluding the UN Convention on Contracts for the International Sale of Goods. If you are a consumer with habitual residence in another country, you additionally retain the protection of any mandatory provisions of the law of that country, as provided by Article 6(2) of Regulation (EC) No 593/2008 (Rome I).

11. Final Provisions

This Agreement constitutes the entire agreement between you and the Author regarding the Software and supersedes all prior or contemporaneous understandings. If any provision of this Agreement is or becomes invalid, the remaining provisions remain unaffected; the invalid provision is replaced by the applicable statutory provision. This Agreement does not limit any mandatory statutory right you have as a consumer.

Contact

Mert Aslantürk, c/o flexdienst - #21852, Kurt-Schumacher-Straße 74, 67663 Kaiserslautern, Germany
Email: hello@game-twin.app