Privacy Policy

SIXTH · playsixth.com · last updated 28 August 2026

SIXTH is a browser game operated by Kach Games. Playing needs no account and no sign-up: you can play the whole game without telling us who you are. An optional account exists only if you want your progress carried between devices — see Accounts and cloud save below.

What the game stores

Your progress — level, streak, hearts, hints, badges, chosen topic and language — is saved in your own browser using localStorage. If you never sign in, it stays on your device: it is not sent to us, we cannot read it, clearing your browser data erases it permanently, and we have no copy to restore.

Accounts and cloud save

You may optionally create an account, with Google sign-in or with an email address and password, so that your progress follows you to another device. Nothing in the game is locked behind it, and you can play forever without one.

• If you sign in, we hold the email address of the account, the display name Google gives us (for Google sign-in), and an account identifier. Passwords are handled by Firebase Authentication and we never see them.
• Your save — the same progress listed above, nothing more — is then stored under that account in Google Cloud Firestore so it can be read back on your other devices. From that point it does leave your device, and we could in principle read it.
• If you invite a friend with your referral link, their display name (or the first part of their email address if they have no display name) is shown in your friends list, and the date they joined is recorded.
• Signing out stops the syncing. To delete an account and everything stored under it, email us at hello.kachgames@gmail.com and we will remove it.

Firebase Authentication and Firestore are operated by Google on our behalf; see the Firebase privacy documentation.

Advertising

The game shows optional rewarded video ads through Google AdSense. You are never forced to watch one; declining costs you nothing but the reward.

• Google and its partners may set cookies or read device identifiers to serve and measure ads, and in some cases to personalise them.
• Google's use of advertising data is described in How Google uses information from sites that use its services.
• You can turn off personalised advertising at Google My Ad Center.

If you are in the EEA, UK or Switzerland, a consent dialog appears before any ads load, and your choice there governs what Google may do. You can change it later from the privacy options link the dialog leaves on the page.

Analytics

We use Google Analytics 4 (through Firebase) to understand how the game is played — which levels are hard, where new players get stuck, whether a rewarded video actually loaded. It records gameplay events such as starting a level, making a guess, using a hint, finishing or failing a level, and which buttons are pressed, along with the game state at the time: your level, topic, streak, hearts, hints, chosen language and the country your browser reports.

• None of it identifies you. Analytics events carry no name and no email address, not even when you are signed in — the only thing they record about an account is whether one is signed in at all.
• Google Analytics assigns a random identifier to your browser and may record a coarse location and device type. Google's handling of it is described in How Google uses information from sites that use its services.
• In the EEA, UK and Switzerland analytics storage is switched off until you allow it in the consent dialog. Declining leaves the game fully playable.
• You can block it outright with any ad or tracker blocker, or with the Google Analytics opt-out add-on. The game does not check, and nothing about it changes if you do.

What we do not do

• No tracking pixels, no fingerprinting, no cross-site profiles.
• No newsletters and no marketing email. The only email address we ever hold is the one you choose to sign in with, and we use it for nothing but signing you in.
• We never sell personal data, and we never share it with anyone beyond the Google services named above.

Playing on YouTube

The YouTube Playables version of SIXTH carries no ads at all and includes no advertising or analytics code — Google Analytics is not loaded there. It reports only your cleared-level count and anonymous crash signals to YouTube through the Playables SDK. Progress there is saved by YouTube rather than by your browser, and all of it is covered by the Google Privacy Policy.

Children

SIXTH is suitable for a general audience and is not directed at children under 13. We do not knowingly collect personal data from anyone under 13; if you believe a child has created an account, write to hello.kachgames@gmail.com and we will delete it.

Your rights

Under the GDPR you may request access to, correction of, or deletion of personal data we hold about you. If you have never signed in, we hold none we could tie to you: your game progress never leaves your device and you can delete it yourself by clearing this site's browser storage, and the analytics events we do send carry no identifier we can trace back to a person. If you do have an account, write to hello.kachgames@gmail.com from its email address and we will send you a copy of what is stored under it, correct it, or delete the account and its save outright. For anything Google holds, contact Google directly.

Contact

Kach Games — hello.kachgames@gmail.com