Parallel Mahjong ~ Revenge of the What-If Player ~

Terms of Use

These Terms of Use ("Terms") set out the conditions for using the game "Parallel Mahjong ~ Revenge of the What-If Player ~" (including the web, PC and smartphone versions; the "App") provided by mowmow (the "Operator"). By using the App, you ("User") agree to these Terms.

1. The App

  1. The App is a single-player mahjong game played against computer opponents (CPUs). It includes a feature that lets you go back to an earlier point in a hand and play it again ("Rewind").
  2. The App has a part that can be played for free (the "Free Trial") and a part that requires purchase (the "Full Version"). What each includes is shown in the App or on the store page.
  3. The App is not intended for gambling for money or valuables. Using the App for gambling is prohibited.

2. License

  1. The Operator grants the User a non-transferable, non-sublicensable right to use the App for personal enjoyment in accordance with these Terms.
  2. Copyright and other rights in the App and in the images, sounds, text and programs it contains belong to the Operator or the rightful owners. The sources of the materials used are listed on the "Credits" screen of the App.

3. Purchasing the Full Version

  1. The Full Version is purchased through each store (Steam, Google Play, the App Store, etc.). Purchases, payments and refunds follow the terms and policies of each store.
  2. Once purchased, the Full Version can be used without further payment (one-time purchase). However, it may become unavailable due to changes in a store or device.

4. Prohibited Conduct

Users must not:

  1. violate laws or public order and morals;
  2. use the App for gambling or betting;
  3. extract, copy, distribute or sell all or part of the App (including materials such as images, sounds, videos and fonts);
  4. disassemble, decompile or modify the App, or distribute a modified version;
  5. circumvent the purchase check of the Full Version;
  6. use the record import or sharing features in a way that infringes the rights of others (copyright, portrait rights, privacy, etc.);
  7. do anything else the Operator considers inappropriate.

5. Game Record Import

  1. The App can load game record files prepared by the User for watching and replaying. Loaded records stay on the User's device and are not sent to the Operator.
  2. The Operator does not provide game records. The User obtains and uses records in accordance with the terms set by their provider, and is responsible for how names of players, teams, etc. in the records are handled.
  3. The Operator is not affiliated with any particular tournament, organization or player.

6. Saved Data

  1. Settings, records, saved hands and other data of the App ("Saved Data") are stored on the User's device, not on the Operator's servers.
  2. The Operator cannot restore Saved Data lost due to device failure, changing devices, clearing browser data, deleting the App, etc. Please export and keep your Saved Data yourself using the "Transfer your data (backup)" feature of the App.
  3. The format of Saved Data may change with App updates. The Operator will try to convert older formats, but does not guarantee that all Saved Data can be carried over.

7. Disclaimer

  1. The Operator does not guarantee that the App is free of defects, fit for a particular purpose, or works on the User's device.
  2. The CPU behavior, scoring and rule interpretations of the App follow the specifications set by the Operator and may differ from the rules of real tournaments, organizations or game services.
  3. Except in cases of intent or gross negligence by the Operator, the Operator is not liable for damages arising from the use of the App. Even where the Operator is liable, its liability is limited to the amount the User paid to the Operator for the App.

8. Changes to and Termination of the App

The Operator may change the content of the App or end its provision without prior notice. When ending the provision of the App, the Operator will announce it in advance in the App or on the website where possible.

9. Changes to These Terms

The Operator may change these Terms as needed. Changed Terms take effect when posted on the website. Important changes will be announced in the App or on the website.

10. Governing Law and Jurisdiction

These Terms are governed by the laws of Japan. Any dispute concerning the App shall be subject to the exclusive jurisdiction of the Tokyo District Court as the court of first instance.

If there is any discrepancy between this English version and the Japanese version, the Japanese version prevails.

Contact

Email: [email protected]

Effective date: November 14, 2026

Privacy Policy / 日本語 / Open the free trial