PlayBrain Mobile

Privacy Policy: Crossmath: Math Puzzle

Last updated: 13 September 2026

1. Summary

• Your progress, your coins, your pencils, your streak and your settings are stored on your device only.
• The app sends anonymous gameplay counts to a server we run, see section 3. It is a short, fixed list of events and a random identifier the app makes up for itself.
• We hold no personal data: no name, no email, no account, no location, no advertising ID, and nothing you have typed, because there is nothing in this app to type into. We have no way of working out who you are.
• The app includes the Google AdMob advertising SDK, see section 4.
• The app carries the code for in-app purchases but the shop is not open yet, see section 5. No price is shown and no payment can be made today.
• We do not sell data, and there is nothing here that could be sold.

2. What is stored on your device

All of it stays on your phone and goes when you uninstall. None of it is sent to us.

• crossmath.progress.v1: your best moves, hints and time on each level.
• crossmath.run.v1: the board you have part way through, so closing the app does not lose it.
• crossmath.wallet.v1: your coins, the themes you own and the one you use.
• crossmath.pencils.v1: your pencils, your boosters and which ranks you have been paid.
• crossmath.streak.v1: your daily streak and what it is counted from.
• crossmath.nomusic.v1, crossmath.nosound.v1 and crossmath.novibrate.v1: your music, sound and vibration switches.
• crossmath.reminders.v1: whether you switched the daily reminder on.
• crossmath.review.v1: how long you have played and whether the app has already asked you to rate it, so that it does not ask twice.
• crossmath.iap.v1: what you have bought, so the app knows what you own before Google Play answers.
• crossmath.telemetry.device.v2, .queue.v1, .session.v1 and .attempts.v1: the random identifier for this install, and any analytics events waiting to be sent.

3. What the app sends to our own server

The app sends anonymous gameplay counts to a server we run at playbrain.games. It is switched off during development and on the web. The identifier attached to them is a random value the app generates on first launch: it is not your advertising ID, not a hardware ID, and not tied to any account, because there is no account. Uninstalling destroys it, and a reinstall is a new install to us.

The complete list of events:

• first_open: the app was opened for the first time after install
• session_start: a play session began, and how many sessions this install has had
• session_end: a play session ended, how long it lasted and which screen it ended on
• screen_view: which screen you are on, and which screen you came from
• first_interaction: the first time you touched anything, and how long after opening
• tutorial_start: the guided first puzzle began
• tutorial_step: which step of the guide you reached
• tutorial_complete: you finished the guide
• tutorial_skip: you dismissed the guide, and at which step
• level_start: a puzzle was opened, which one, and which attempt this is
• level_complete: a puzzle was solved, how long it took and how many moves
• level_fail: a puzzle was lost, and why
• level_abandon: a puzzle was left unfinished, how far through, and how you left it
• currency_earned: in-game currency was earned, and from what
• currency_spent: in-game currency was spent, and on what
• currency_blocked: something cost more in-game currency than you had
• ad_offer_shown: an optional advert was offered
• ad_offer_hidden: an optional advert was not offered, and why
• ad_offered: you tapped an optional advert offer
• ad_load_result: whether an advert was available, and how long it took
• ad_result: how the advert ended
• ad_reward_granted: the reward for watching was given
• ad_declined: you declined an advert offer
• interstitial_check: whether an advert break was due after a level, and if not, why not
• interstitial_shown: an advert break was shown between levels
• interstitial_result: how the advert break ended, and how long it was open
• iap_store_open: the shop screen was opened
• iap_offer_shown: a purchasable item was shown
• iap_purchase_start: you tapped buy
• iap_purchase_result: whether the purchase completed, was cancelled, is pending, or failed
• iap_restore_start: you asked to restore purchases
• iap_restore_result: whether the restore found anything
• iap_entitlement_changed: what you own in the game changed
• iap_unavailable: the store could not be reached
• feature_used: a feature was opened, completed, claimed or switched
• review_prompt_shown: the rating prompt was requested
• review_prompt_skipped: the rating prompt was not shown, and why
• cross_promo_open: the More games sheet was opened
• cross_promo_click: another of our games was tapped
• app_error: something went wrong, which kind of error and on which screen, with no message and no personal data
• action_blocked: the app refused something you tried, and why (for example, not enough currency)
• dead_tap: you touched something and nothing happened, and what you touched

That is all of it. The app has no free-text field anywhere, so nothing you type can reach us, and it never sends the contents of a board or anything about your device beyond the platform it runs on.

4. Advertising (Google AdMob)

There are three kinds, and they are not the same thing:

• Rewarded video you choose. Each one is a button you decide to press, it is marked AD, and it names what it gives you before you press it. Declining costs you nothing you had already earned.
• A short full-screen advert on the tap that leaves a board you have finished. Never during play, never on one you have not finished, never in your first few, and never more often than a fixed cap allows. It is also skipped when you have just watched a rewarded video of your own choosing.
• A banner strip under the board. Never over it, and never on a menu, a card or the shop. The space it takes is reserved whether or not an advert fills it, so nothing moves under your finger.

The Remove ads purchase takes away the full-screen advert and the banner. It deliberately does not take away the rewarded videos: those are help you asked for, and removing them would be a downgrade sold as an upgrade.

Before the advertising SDK starts, the app asks Google's consent tool whether consent is needed where you are, and shows the form if it is. If you decline, the app runs with advertising switched off rather than falling back to something else, and you can still play everything. You can reopen the form at any time from Settings, Privacy options. The app also requests non-personalised adverts only.

When an advert is requested, Google receives your device's IP address and may use an advertising identifier to select and measure adverts. That processing is Google's, under Google's own policy, not ours. We never receive your advertising ID.

5. In-app purchases

The app carries the code to sell pencils — the help currency — a starter set, and an option to remove the adverts you did not ask for. The shop is not open yet: no product exists in Play, no price is shown, and no payment can be made. The eight iap_* events in section 3 are emitted by that code regardless, which is why they are listed there.

Coins can never be bought. They are earned by playing and buy colour themes; letting money buy them would make every theme price meaningless. Only the help currency is for sale.

When the shop does open, payment is handled entirely by Google Play: we never see, receive or store your card details, your name, your address or your email, and there is no third party between you and Google. What our own events record is a product identifier our own code chose, such as crossmath.pencils_small, and an internal price TIER such as t1 — never a price, a currency, a country, a payment method or a transaction id.

6. Daily reminders

The app can send you a local reminder that your daily gift is ready, and a nudge if you have not played for a couple of days. It is off until you switch it on in Settings, and that switch is the only thing that ever asks Android for notification permission: the app never asks at launch.

They are local, which is the part that matters here. The reminder is scheduled on your own device by Android and fires there. Nothing is sent to a server, there is no push service, no token and no third party involved, and we cannot tell whether one was delivered or whether you opened it. Turning the switch off cancels everything already scheduled, and so does revoking the permission in your phone's settings: the switch checks with Android every time the app comes back to the screen and turns itself off if the permission has gone.

7. What the app does not do

• No account, no email address, no password, no sign-in.
• No selling of your data, and no advertising identifier used by us to profile you.
• No exception messages, stack traces or file paths. The app does report its own errors, as the app_error event above, but only the KIND of error and the screen it happened on.
• No location, no contacts, no photos, no microphone. The app plays sound and never records: the microphone permission is explicitly blocked, along with storage, media and the permission to draw over other apps.

8. Children

Crossmath is not directed at children under 13 and we do not knowingly collect information from them. Nothing in the app asks a player for personal information.

9. Your rights and deleting your data

Uninstalling removes everything the app stored, including the random analytics identifier. Events already sent are anonymous and not linked to a person, so there is nothing tied to you for us to delete. If you would like the events from a particular install removed, write to the address below with the install id and we will delete them.

10. Changes

If the app's data practices change, this page is updated before that version ships and the date at the top changes with it.

11. Contact

Questions about this policy: [email protected]