Last updated October 19, 2026
Math Crosswords is operated by Vladimir Duțan. Contact: vlad.dutan@gmail.com.
Math Crosswords is a number crossword you play in the browser. You place number tiles so that every equation is true.
Accounts are optional. You can play as a guest.
If you create an account with email and password, the app stores your email, your password in protected form, and your name if you give one. The name is shown on your profile.
If you sign in with Google, Google shares your email address, your name, and your profile photo. The app uses those to sign you in and to show your name and photo on your profile. The app does not receive your Google password.
For each difficulty, Easy, Medium, Hard, and Expert, the app stores how many games you started, how many you won, and your best time. Signed-in totals are saved with the account. Guest totals stay on this device only. Starting a new puzzle counts as a game started. Restarting the same puzzle does not. A win is recorded once.
When a guest starts a new puzzle, the app also saves a record of the game on its server: the difficulty, whether it was Quick Play or a daily, the start and finish times, and the hints used, and an approximate country, region, and city taken from the connection. The first time a device has no source stored, that record can also include where the visit came from: the referring site as a host name only (never the full web address, the path, or the query string), and utm_source, utm_medium, and utm_campaign when the landing link had them. Later puzzles do not replace that, and older records are left empty. The record carries a random code kept in this browser, so the same device counts once. It holds no name, email, account, or IP address. It is used only to count how many people play without an account, and which sites send them.
If the game is opened inside another website, Create account and Sign in open math-crosswords.com in a new tab. A short-lived code can carry this browser's guest streak and solve times to that tab. The code works once, expires after 20 minutes, and is not an account. The random device code itself is not put in the link.
Signed-in wins earn points. For each signed-in game the app stores the difficulty, the start and finish times, the hints used, and the points. Your total points and a display name appear on the public leaderboard. The display name is your saved name or your Google name, or Player and a short code if you have neither. Your email is never shown. You can hide yourself from the leaderboard in your profile.
A signed-in player can delete the account from the profile. That deletes the account, its stats, and its points and cannot be undone. Guest totals on that device are cleared at the same time.
The site shows ads through Google AdSense. Ads and their cookies load after the player accepts the consent message. Google may use cookies to show and measure ads. The player can refuse ads in that message.
If you send a note from Report a problem / Feedback, the app stores the message, an optional category (bug, puzzle error, or idea), and an email only when you type one so a reply can be sent. It also stores the page address with any one-time sign-in handoff code removed, the puzzle date and level when you send it from a puzzle, the browser's user agent, the viewport size, your account id when you are signed in or this browser's guest device id otherwise, and a hash of the connection address used only to limit how many notes one connection can send. Those notes are not shown to other players.
If you are signed in and check "Email me when the new daily is up" on your profile or on the solved-screen account prompt, the app stores a reminder subscription: your account id, the email address on the account, whether you opted in, when you consented, whether that was from the profile or the account prompt, when you unsubscribed, and a random unsubscribe code. The checkbox starts off. The address is used only to send that reminder. Every reminder includes an unsubscribe link that works without signing in, and mail apps can unsubscribe in one step from the same address. Unchecking the box, or opening the link, turns the reminder off and records when you unsubscribed. Deleting the account deletes the subscription. The address is not put in a web address or in analytics.
This information is used to run the game, keep stats, sign the player in, answer feedback, send a daily reminder you opted in to, and show ads. Personal information is not sold.
Questions: vlad.dutan@gmail.com.