Terms of Service

Last updated: October 5, 2026

Welcome to Mahjor Plays ("Service", "we", "us", "our"). By creating an account or using our Service, you agree to these Terms of Service ("Terms"). Please read them carefully.

1. Service Description

Mahjor Plays is a web application for learning and practicing American Mah Jongg, for educational and recreational purposes. Its coach's write-ups and answers are written by artificial intelligence provided by Anthropic. Mahjor Plays is not affiliated with or endorsed by the National Mah Jongg League.

2. Account Requirements

You must provide a valid email address that you can receive mail at, and verify it when we ask you to.
You must be at least 13 years old to create an account.
You are responsible for maintaining the security of your account credentials.
You may not create multiple accounts to circumvent usage limits.
Account access may require approval by an administrator.

3. Acceptable Use

You agree not to:

Use the Service for any illegal or unauthorized purpose, including gambling: nothing of value is wagered or won in the Service.
Attempt to access the Service through automated means (bots, scrapers, etc.).
Attempt to reverse engineer, decompile, or extract the underlying algorithms.
Interfere with or disrupt the Service or its infrastructure.
Share your account credentials with others.

4. Advice and Reviews

The Service's suggestions and reviews are its best judgment of a game, not a guarantee. You should use your own judgment, and we are not responsible for any outcome of following them.

The coach's write-ups, its answers to "Why?" and the puzzle's explanations are written by an AI model from the Game Review, and a puzzle's explanation is approved by us before it's shown. We check every tile, number and hand in them against the review before you see them, but the words can still be wrong or unclear: the review is what counts. Tell us with "Something wrong or unclear?" under the words.

5. Subscription and Billing

Free Tier

Free accounts may use the Service with the limits shown in the pricing on our home page and on your Account page.
Daily limits reset at midnight UTC, and weekly limits (the coach's write-ups) at midnight UTC on Monday.
We may adjust free tier limits at any time.

Pro Tier

Pro's price, and any sales tax, VAT or GST that applies where you live, are shown before you buy.
Pro may be sold through Link, a Stripe company, as the seller (merchant of record) of your subscription: it takes the payment, collects and pays any tax, and sends your receipts. Your purchase is then also covered by Link's terms.
Pro is billed monthly or yearly, as you choose when you buy it. Your subscription renews at the end of each month or year until you cancel it.
You may cancel at any time: choose Manage Pro at the top of the app.
Cancelling stops future charges. Pro normally continues until the end of the period you've paid for; if the subscription is ended at once instead (for example, with a refund), Pro ends then.
If a payment fails, Stripe tries again for a while; if it still can't collect, your account goes back to the Free tier.

Refunds

If Pro doesn't work as described, or you were charged by mistake, contact us (the Feedback form) and we will refund you.
We don't give partial refunds for the unused part of a month or year after you cancel, except where the seller's refund policy or the law says otherwise.
Where the law gives you a right to cancel a purchase within a set period (for example, 14 days in the UK and the EU), you can use it.

6. Intellectual Property

The Service's design, code, branding, artwork, and documentation are our intellectual property.
Reviews and suggestions the Service gives you are for your personal use.

7. Data Usage

See our Privacy Policy for full details on data collection and usage.

8. Service Availability

Usage may be subject to daily limits based on your tier.
The Service depends on third-party services (including Anthropic, for the coach's words) and may experience downtime or degraded performance.
We do not guarantee 100% uptime or availability.
We may implement additional rate limits or usage restrictions to maintain service quality.

9. Account Termination

You may delete your account on the Account page in the app (once any Pro subscription has ended: cancel it in Manage Pro first), or at any time by contacting us.
We may suspend or terminate accounts that violate these Terms.
We may suspend accounts with unpaid balances or fraudulent payment activity.
Upon termination, your account data may be deleted.
Active subscriptions will be canceled upon account termination.

10. Limitation of Liability

TO THE MAXIMUM EXTENT PERMITTED BY LAW:

THE SERVICE IS PROVIDED "AS IS" WITHOUT WARRANTIES OF ANY KIND, EXPRESS OR IMPLIED.
WE ARE NOT LIABLE FOR ANY INDIRECT, INCIDENTAL, SPECIAL, CONSEQUENTIAL, OR PUNITIVE DAMAGES.
OUR TOTAL LIABILITY SHALL NOT EXCEED THE AMOUNT YOU PAID US IN THE 12 MONTHS PRECEDING THE CLAIM.

11. Indemnification

You agree to indemnify and hold us harmless from any claims, damages, or expenses arising from your use of the Service or violation of these Terms.

12. Changes to Terms

We may update these Terms from time to time. When we do:

We will update the "Last updated" date at the top of this page.
For material changes, we will notify you via email.
Continued use of the Service after changes constitutes acceptance of the new Terms.

13. Governing Law

These Terms are governed by the laws of the United States. Any disputes will be resolved through binding arbitration in accordance with applicable rules.

14. Contact

If you have questions about these Terms, please use the Feedback form in the application or contact us via email.