Privacy

Last updated: 19 October 2026.

Operated by Mas Ueno.

Your quiz progress

The quiz saves the set, order, answers, progress, start time and event delivery markers in this tab’s session storage. It does not require an account. If storage is blocked, you can still play while this page is open. Closing the tab normally ends this storage.

Optional analytics

With your permission, this site uses Google Analytics 4 to understand visits, quiz use and sharing actions. Before you allow analytics, and when you reject it, no analytics tag or analytics request is sent. Playing and sharing work either way.

When enabled with your consent, analytics receives allowed quiz events, question IDs, correctness, score, duration, general device and country information, and sanitized campaign parameters. Google processes IP addresses to derive coarse location; this site does not send names, email addresses, free text, complete referrers, or personal referral codes. Advertising personalization, Google Signals and session recording are disabled.

Storage and providers

Your analytics choice, selected currency and optional theme are kept in local storage until you clear them or change the setting. GA4 may set first-party _ga cookies after consent; those cookies can last up to two years under Google’s configured settings. Event-level and user-level retention are set to two months in this site’s dedicated GA4 property, without resetting retention for new activity. Aggregated reports may follow separate Google retention rules.

Vercel hosts this site and may process network request information under its hosting policies. Google’s processing follows its privacy policy. Analytics reports are available only to the operator and authorized members.

Change your choice

Use Cookie settings in the footer to allow or reject analytics. Withdrawal stops future events and removes analytics cookies controlled by this site. Previously collected data is not automatically deleted by withdrawing consent.

Prices and exchange rates

The quiz uses dated official Japanese yen price sources. Currency conversion uses the previous calendar month’s published Federal Reserve H.10 rates, retrieved by our server. Your selected currency is a functional browser setting; it is not sent to the Federal Reserve.