Privacy Policy — Perfect Stack

Last updated: October 30, 2026

This Privacy Policy explains what information Perfect Stack ("the App", "we", "us") collects, how it is used, and the choices you have. Perfect Stack is a stacking game published by Nayprek Studios.

In short: the App does not ask for your name, email, or any personal account details. Your game progress is stored on your device. If you choose to sign in with Google Play Games, your progress can also be backed up to your Google account. The App shows ads and offers in-app purchases, both handled by Google — see below for what that means for your data.

1. Information We Collect

Information stored on your device:

Your best score, best combo, number of games played, and achievement progress
The skins and purchases you own, and your progress toward unlocking skins
Your app settings (theme, skin, sound, vibration)

This information stays on your device and is not sent to us. It is deleted if you uninstall the App.

Information handled by Google Play Games Services (only if you choose to sign in):

Your Google account ID, used to save and restore your progress across devices
The saved game data described above, stored by Google as your cloud save

Signing in is optional. If you don't sign in, your progress stays local to your device only.

Information handled by Google AdMob (advertising):

Advertising identifiers, device information and ad interaction data, used to show and measure ads
Depending on your device and region, ads may be personalized based on your interests, or non-personalized

Information handled by Google Play Billing (in-app purchases):

Purchase transactions are processed entirely by Google Play. We receive confirmation that a purchase was made, but we never see or store your payment details (card number, billing address, etc.)

2. Third-Party Services

The App uses the following third-party services, each governed by its own privacy policy:

Service	Purpose	Privacy Policy
Google AdMob	Displaying ads	policies.google.com/privacy
Google Play Billing	Processing in-app purchases	policies.google.com/privacy
Google Play Games Services	Cloud save, sign-in	policies.google.com/privacy

3. Children's Privacy

Perfect Stack is intended for a general audience and is not directed at children under 13 (or the relevant age in your region). We do not knowingly collect personal information from children. If you believe a child has provided us with personal information, please contact us using the details below so we can remove it.

4. Data Retention

Local progress data is retained on your device until you uninstall the App or clear its data. Cloud save data (if you sign in with Google Play Games) is retained by Google according to your Google account settings, and can be deleted by unlinking the App from your Google account or contacting Google.

5. Your Choices

You can play without signing in to Google Play Games — your progress simply won't sync across devices.
You can opt out of personalized ads in your device's ad settings (Android: Settings → Google → Ads → "Opt out of Ads Personalization").
You can uninstall the App at any time to remove all locally stored data.

6. Changes to This Policy

We may update this Privacy Policy from time to time. Changes will be posted on this page with an updated "Last updated" date. Continued use of the App after changes means you accept the updated policy.

7. Contact Us

If you have questions about this Privacy Policy, contact us at: nayprekstudios@gmail.com