Frequently asked questions

No. There is no account system on this site at all. The calculators and trainers run entirely in your browser, and nothing you type is sent anywhere. Your practice progress is stored in your browser's local storage on your own device.

Partly. The calculators and trainers have English or language-neutral interfaces, and this section explains the site in English. The 20-lesson course, the question banks and the cheat-detection handbook are written in Chinese and are not machine-translated — a bad translation of a strategy course does more harm than good. See the table on the home page for what is readable without Chinese.

Riichi, East-round rules: ippatsu on, ura dora on, three red fives, double-wind 4 fu, open tanyao allowed, counted yakuman at 8000. Mangan uses the standard trigger (base points ≥ 2000 — 3 han 70 fu / 4 han 40 fu / 5 han); kiriage mangan is not applied.

Because those discards genuinely have the same shanten and the same number of improving tiles. That is a real tile-efficiency result — with several equally good discards you then choose by safety, dora and turn number. It is not a bug in the analyzer.

Only if you exported it. Because there is no server, clearing browser data permanently deletes your progress. The progress centre can export everything as a JSON file, copy it as a compressed transfer code, or turn it into a link you can open on another device. We recommend doing that once.

Yes. Open the progress centre and use Copy transfer code — it compresses your records into a short text string. On the other device open the same page and use Import from clipboard. There is also a link form if you prefer to send it to yourself by message.

No, but the site is a Progressive Web App — on a phone you can add it to your home screen and it will behave like an app, including working offline for pages you have already visited.

No. The anti-cheat section exists so that players can recognise and defend against rigged games. It is written from the defensive side, and the site explicitly opposes gambling. If you suspect cheating in a real game, preserve evidence and report it to the authorities.