Privacy Policy
Last updated 22 August 2026
What is stored, and where
Your progress is kept in your browser's localStorage under this
domain. That includes your rating, daily streak, puzzle history, gem balance
and whether you have unlocked The Vault.
This data sits on your computer. It is not uploaded, not backed up by us, and not readable by us. Clearing your browser data for this site deletes it permanently, and there is no copy anywhere else.
What we do not collect
- No accounts, names, email addresses or passwords
- No analytics or tracking scripts of our own
- No cookies set by us. Google AdSense sets its own — see Advertising below
- No payment details — nothing here is for sale
Third-party content in The Vault
The Vault embeds browser games that are hosted by other people, loaded in an isolated frame from their own websites. When you open one, your browser connects directly to that host, which will see your IP address the same way visiting any website does. Those hosts have their own privacy practices, which we neither control nor can speak for.
Each game is sandboxed, and the sandbox deliberately withholds permission to open new tabs or navigate this page away, so an embedded game cannot redirect you elsewhere.
Hosting
The site is served as static files by Cloudflare Pages. Cloudflare processes standard request logs (IP address, user agent, requested URL) as part of serving and protecting any website. See Cloudflare's own privacy documentation for what that involves.
Advertising
This site uses Google AdSense to show advertising. Google is a third-party vendor, and it and its partners use cookies to serve ads based on your prior visits to this and other websites.
Google's use of advertising cookies lets it and its partners serve ads to you based on your visit to this site and other sites on the internet. You can opt out of personalised advertising at Google Ads Settings, or opt out of third-party vendors' use of cookies for personalised advertising at aboutads.info.
If you are in the European Economic Area, the United Kingdom or Switzerland, you will be shown a consent message before any advertising cookies are set. It is provided by Google's certified Consent Management Platform, and it offers consent, refusal and per-purpose options equally. Your choice is remembered and can be changed at any time from the same message.
Advertising appears on MatrixMind and inside The Vault. Ads are never shown inside a game itself — the games are chosen from hosts that carry no advertising of their own.
Children
MatrixMind is a reasoning-practice site suitable for all ages. Because it collects no personal information at all, there is nothing about a child user to protect, share or delete.
Contact
Questions about this policy: see the contact page.