Privacy & analytics
Updated: October 22, 2026
Local saves
The game stores your board, best score, theme, collection, and sound preferences in your browser. No account is required; this local data lets you continue playing. Clearing site data may delete your saves.
Leaderboards & sharing
Only when you choose to submit a score or create a share do we send the relevant nickname, random player identifier, theme, score, and replay records to the server. Leaderboards display nicknames and scores; anyone with a shared link can view its contents. Standard best scores are kept long term, and shared board challenges are kept for 30 days.
Play analytics
To understand how people play the game, we use a separate random browser identifier to record the dates of moves that change the board, a session identifier, and cumulative active play time. Time is counted only while the page is visible and focused; it pauses after 30 seconds without a move that changes the board. Opening or refreshing the page alone does not count as active play.
We use this data to calculate daily active browsers, average play time, the returning-browser share, and day-1 and day-7 retention. Statistics use UTC calendar days. Identifiers distinguish browsers, not individual people. Changing devices, clearing site data, or turning off analytics affects the results.
The analytics database does not store IP addresses, nicknames, board contents, full URLs, or browsing history. Session records are kept for at most 90 UTC calendar days. A random browser identifier, its first active date, and its last report time are kept for at most 395 days after its last report. Analytics waiting to be sent from the browser is kept for at most two days.
Analytics preference
Reading this browser’s analytics preference…
Turning analytics off stops new play reports and deletes this browser’s analytics identifier and pending queue. Existing server statistics are not automatically deleted. Saved games and leaderboards are unaffected. Analytics also stops when your browser sends Do Not Track or Global Privacy Control.
Service providers & advertising
The site uses Cloudflare for hosting and database services. To deliver and protect the site, Cloudflare processes information needed for network requests. The application uses request IP addresses for rate limiting but does not write them to the play analytics database.
The game currently loads no Google ads or other advertising SDKs. Before introducing advertising, we will update this notice and the relevant privacy choices.
Contact
For data or privacy questions, email: liuzhiheng@moxunzhi.com