Privacy Policy: Crossmath: Math Puzzle

Last updated: 14 October 2026

1. Summary

Your progress, your coins, your gems, 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 (other than the country, see section 3), 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 offers optional in-app purchases through Google Play, see section 5.
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.gems.v1: your gems, the boosters you are holding, which daily gifts you have taken 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
install_attribution: where this install came from: a Google ad, the Play Store, another PlayBrain game, or elsewhere, plus the ad campaign name (never the ad click identifier). Sent once, 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
ad_revenue: what one advert earned, as reported by the ad network (the advert type, the amount, its currency and how precise the network says that amount is)
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
reminder_offer_shown: the game offered to send you reminders
reminder_offer_result: whether you said yes or not now to that offer
reminder_permission_result: whether your phone allowed notifications when asked
reminder_scheduled: a reminder was set, what kind and how many hours away
reminder_opened: you opened the game from a reminder
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)

Our server also records the country you are in, which it works out from your network address when the app first reports; the address itself is not stored.

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.

Gameplay diagnostics and optional session recording

In updated versions that include diagnostics, we collect crash categories and a short code-location fingerprint to identify bugs. We do not send exception messages, stack traces, account details or anything you type.

If you choose to allow gameplay recording, PlayBrain can reconstruct a sample of your play using screen changes, taps, timing and game state. This is not video or audio recording. Nonogram captures puzzle marks and Idle Tycoon captures business and currency state. Other games provide action timelines. Recordings use a random session identifier, not your advertising ID.

Recording is off until you allow it. Change your choice in Settings, Gameplay recording. Declining does not affect gameplay, rewards or purchases. Each capture lasts at most ten minutes. Captures become unavailable after seven days and are deleted during our daily cleanup. We use our existing backend, not a third-party session-recording service.

Your choice and at most one pending recording are stored on your device. Recordings are encrypted in transit and available only to our private review tools. We use them to identify bugs and confusing gameplay, not for advertising or tracking across apps.

4. Advertising (Google AdMob)

There are two 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.

The Remove ads purchase (section 5) takes away the full-screen advert. 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.

In the EEA, the UK and Switzerland, Google's consent form is shown before any advert is requested, and your answer can be changed at any time from Settings, Privacy options. Declining changes nothing about what you can play.

When an advert is requested, Google collects the advertising ID, device information, the IP address and your interaction with the advert. That processing is Google's, under Google's own policy, not ours. We never receive your advertising ID.

5. In-app purchases

The shop sells packs of gems (the help currency) and an option to remove the adverts you did not ask for. Payment is handled entirely by Google Play: we never see your card, your name or your address. The eight iap_* events in section 3 record which product was shown and bought, never an amount of money.

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 and the advert removal are in the purchase catalogue.

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.gems_small, and an internal price TIER such as t1: never a price, a currency, a country, a payment method or a transaction id. What you own is worked out from what Google Play itself reports, on the device, every time the app starts.

Gem packs are consumable: they are spent in the game and are not restored by a reinstall, because Google Play does not report a purchase once it has been consumed. The Restore purchases control says so when you press it. The advert removal is not consumable and is restored.

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]