Frequently Asked Questions (FAQ)

Yes. You can create and join sessions without logging in. An anonymous account is automatically created in the background. Rule explanations, help, and national rankings are also available without login.

However, creating custom rules, friend features, and creating circles require a logged-in account.

Yes. In the "Match History" tab on the dashboard, enter the session ID to transfer your guest records to your current account.

The session ID is displayed on the session end screen.

Yes. Click the "Link with Google Account" button in the warning banner on the dashboard. All anonymous account records will be preserved.

Use the "Forgot password?" link on the login page to send a password reset email.

Yes, if you signed up with email/password. Go to the Settings page and click "Change Email" in the Security section. Enter your new email address and current password. A verification email will be sent to the new address.

This option is not available for Google sign-in accounts.

Yes, if you signed up with email/password. Go to the Settings page and click "Change Password" in the Security section. Enter your current password, then your new password twice to confirm.

Yes. Go to the Settings page and scroll to the "Danger Zone" section. Click "Delete Account" and type the confirmation word to proceed. This permanently deletes your Firestore data and authentication account. A recent login may be required.

Account deletion is not available for anonymous accounts.

After logging in, access the Settings page from "Settings" in the header. From there you can change your display name, language, profile/ranking visibility, email address, password, or delete your account.

Four official rules are supported: Koi-Koi, Hanawase, Inobota-Chūshin, and Hachihachi. You can also create and use custom rulesets from "Community Rules".

It depends on the rule:

• Koi-Koi: 2-5 players
• Hanawase: 3-7 players
• Inobota-Chūshin: 3-7 players
• Hachihachi: 3-7 players

Yes. Only the session creator (host) can record and edit scores. Other participants can view scores in real-time.

Yes. The host can add players from the "Participants" tab during an active session. Participants can also join via QR code or join code at any time.

Check the following:

1. You must have a logged-in account (anonymous accounts don't appear in national rankings)
2. Set your ranking visibility to "Public" on the Settings page
3. For HP ranking, play at least 1 rated game using an official rule. For Rule Avg Score (national), play at least 3 matches

HP is a performance rating based on the Elo system, adapted for multi-player games. All players start at 1500 HP. Your rating changes after each session using an official rule (Koi-Koi, Hanawase, Inobota-Chūshin, Hachihachi). The change depends on your rank, score, opponent ratings, and how many rounds were played (at least 20% of 12 rounds must be completed).

HP appears in the dashboard stats, match history, and the ranking page.

National rankings cover official rules only. Custom rule stats can be viewed in circle and friend rankings.

Bookmark a rule from "Community Rules" or create your own. When creating a session, select your rule from the "My Rules" dropdown below the official rules.

Yes. Use the "Copy" button on a rule's detail page to duplicate it as your own. The copied rule can be freely edited.

Japanese and English are supported. Switch languages using the button in the header, or set your default language in the settings page.

The league feature is currently under development. Season-based league matches within circles are planned for a future release.

There is a feedback form at the bottom of the help listing page. Feel free to send suggestions, requests, or bug reports (login required).