Terms of Use
Effective date: August 29, 2026
Last updated: August 29, 2026
These Terms of Use (the "Terms") set out the conditions for using the mobile application "Yomoe Sudoku" (the "App") provided by Yomoe Studio ("we", "us"). You are deemed to have agreed to these Terms at the point you download or use the App.
Article 1 (What the App is)
The App is a personal game application for playing Sudoku (Number Place) puzzles. All puzzles are generated on your own device and are guaranteed to have exactly one solution. Every way of playing, including puzzle generation and gameplay, is available without a network connection.
Article 2 (Conditions of use)
1. You shall use the App in compliance with these Terms and all applicable laws.
2. Minors should use the App with the consent of a parent or guardian. The App is not directed to children under 13.
Article 3 (Prohibited conduct)
You shall not do any of the following when using the App.
(1) Copy, modify, disassemble, decompile, or reverse engineer the App
(2) Redistribute, sell, lend, or publicly transmit the App or any part of it
(3) Circumvent or disable the App's ad display or billing features (including attempting to obtain Pro version features by altering backup data)
(4) Place an excessive load on our servers or network, or attempt unauthorized access
(5) Violate laws or public order and morals, or engage in any other conduct we deem inappropriate
Article 4 (Data management and responsibility)
1. Your game state, results, achievements, and settings are stored only on your device. We do not hold or manage them and cannot restore them.
2. We are not responsible for restoring data lost through loss, failure, reset, or replacement of your device, uninstallation of the App, or defects in the OS or the App.
3. We recommend that you protect your data periodically using the App's backup feature. Storing and sharing an exported backup is your own responsibility.
Article 5 (Advertising)
1. The App displays ads in order to remain available free of charge.
2. Ads are delivered by third-party advertising providers. We do not warrant the accuracy, legality, or safety of ad content, of the goods or services offered by advertisers, or of the destinations that ads link to. Any transaction with an advertiser is between you and that advertiser, and we are not a party to it.
3. The handling of information associated with ad delivery is governed by the Privacy Policy.
Article 6 (In-app purchase)
1. The App offers a paid version (the "Pro version"). The Pro version provides the following.
(1) No ads inside the App
(2) Unlimited hints (the free version provides 3 hints per puzzle, after which more can be obtained by watching a video ad)
(3) All 5 board themes (the free version provides only the default one)
2. Even in the free version, all of the Classic, Daily Challenge, Journey (all 120 levels), Speed, and Zen modes, as well as all achievement and statistics features, are available without restriction. The Pro version does not unlock any of these ways of playing.
3. That hints cannot be used in Speed mode, and that using hints affects the star rating awarded, remain the same in the Pro version. These are gameplay rules, not restrictions imposed by payment.
4. Purchase procedures, billing, and refunds are governed by the terms and practices of the Apple App Store or Google Play. We do not process payments and are not in a position to decide whether a refund is granted. If you wish to request a refund, please follow the procedure of the relevant store.
5. Purchased features can be restored using the same account (Apple ID / Google account) used at the time of purchase. Transfer between different accounts or different platforms is not possible.
6. If the display of your purchase status is lost due to device loss or data erasure, please use the restore purchase feature inside the App.
Article 7 (Changes, suspension, and termination of the service)
1. We may change the content of the App, add or remove features, and suspend or terminate its provision.
2. The preceding paragraph includes changes to how features are divided between the free version and the Pro version (including changes to the scope of features available in the free version). We do not guarantee that the scope of the free version's features, or its availability free of charge, will be maintained in the future.
3. For changes that materially affect users, we will give notice by posting within the App or by another appropriate method, a reasonable period before the change takes effect. This does not apply in cases of emergency maintenance, security necessity, or legal requirement.
4. Notwithstanding the preceding three paragraphs, for users who have already purchased the Pro version, we will not make the features provided at the time of purchase paid features again, nor will we restrict them.
5. We are not liable for damages arising to users from changes under this Article, except where paragraph 4 is breached.
Article 8 (Intellectual property)
Copyright, trademark rights, and other intellectual property rights relating to the App belong to us or to the rightful holders. These Terms grant you a non-exclusive right to use the App within the scope of these Terms and do not transfer any intellectual property rights.
Article 9 (Disclaimer of warranties and limitation of liability)
1. The App is provided "as is". We make no warranty of any kind, express or implied, as to its completeness, accuracy, usefulness, fitness for a particular purpose, or freedom from interruption or error.
2. We are not liable for damages arising to you from use of, or inability to use, the App, except where we have acted with intent or gross negligence.
3. Even where we are liable, the amount of compensation is limited to the amount you have paid to us in relation to the App.
4. This Article does not apply to the extent it would be invalid under the Consumer Contract Act or other mandatory law.
Article 10 (Changes to these Terms)
We may change these Terms where we deem it necessary. The changed Terms take effect when posted within the App or on the app store, and if you use the App after the change you are deemed to have agreed to the changed Terms.
Article 11 (Language)
1. The Japanese version of these Terms is the authoritative text.
2. We may provide translations into English and other languages for your convenience. Translations are provided for reference only, and in the event of any discrepancy or difference in interpretation between the Japanese version and a translation, the Japanese version prevails.
3. The preceding two paragraphs apply equally to the Privacy Policy and other documents we provide in relation to the App.
Article 12 (Governing law and jurisdiction)
These Terms are governed by the laws of Japan. In the event of a dispute between us and a user in relation to the App, the Tokyo District Court shall be the exclusive court of first instance by agreement.
Article 13 (Contact)
For inquiries about these Terms, please contact us at:
Yomoe Studio
contact@yomoestudio.com