Privacy

What is stored

• If you sign in: the name, email address and avatar your sign-in provider gives us, and a session cookie that keeps you signed in.
• If you play as a guest: a random identifier in a cookie that keeps your matches together. It is not linked to your name.
• Each match as a replayable record: the game, the level, the moves or inputs with their timing, and the result.
• A usage event for each step of a counted match (started, finished, resigned, abandoned) with the game, level, opponent name, how long it took, the result, whether you opted out of training, and a device class (phone, tablet or desktop). Each event carries an opaque player code, not your name, email or account id. These events feed a private page only the site owner can open, and they are deleted with your account.
• Your rating in each game. Once you have played the minimum number of rated games in a game, your first name (never your email) and rating are listed on that game's public leaderboard. The "Show me on the leaderboard" switch on the settings page turns that off.
• Your choice about training use (the switch on the settings page and in the notice on a play page).

What is not stored

We do not store IP addresses or raw browser strings: the browser string is reduced to a device class and dropped. No third-party analytics run on this site. Match records do not contain your name or email, and the games use play chips only, so no payment details are ever collected.

Why, and on what basis

Match records are how the agents get better: the strongest agent is retrained on them, and a new version replaces the old one only if it measurably wins. Ratings and the stats pages come from the same records. Using matches to train the agents rests on legitimate interest, not on a consent tick box. A notice is shown before your first match, the switch starts on, and turning it off is one click. Chess, Heads-Up Hold'em, Word Duel, Tinderbox and Coldstore matches are not used for training at present: those agents do not learn from human matches yet.

Opting out

Turn off training use on the settings page or in the notice on the play page of any game that learns from matches, as a guest or signed in. Opting out also clears the flag on every match you played before, so none of them is exported for training. Your matches still count for your rating and stats. Turning it back on applies to matches from then on only.

Deleting your data

Signed-in players can delete their account in settings. That removes the account, sign-in links, sessions, ratings and every match record tied to it, including matches this browser played as a guest before you signed in. A copy already used to train an agent cannot be pulled back out of a trained model, but no record of it remains. Guests can clear their cookie to disconnect from their matches.

Who else sees data

Your sign-in provider (Google or GitHub) sees that you signed in here. Our host and database provider store the data above. If error reporting is switched on, a crash report with the error and page address goes to Sentry; it does not carry your name or email. We do not sell data or show ads.