This Privacy Policy describes how Stack Blitz ("we", "our", or "the app") collects, uses, and protects information when you play. Stack Blitz is a mobile arcade game published on Google Play. We are committed to handling your information responsibly and transparently.
Short version: Stack Blitz collects the minimum data needed to run the global leaderboard and serve ads. We do not collect your name, email, phone number, location, or any other personally identifying information. All gameplay data is stored locally on your device.
Stack Blitz collects two categories of data: data stored only on your device, and data sent to our online leaderboard. The table below details every data point.
| Data Point | Where Stored | Purpose | User-Provided? |
|---|---|---|---|
| Display name | Device + Firestore | Shown on global leaderboard | Yes — you choose it |
| Anonymous user ID | Firestore | Link scores to leaderboard entry | No — auto-generated |
| High score | Device + Firestore | Leaderboard ranking | No — gameplay result |
| Best level reached | Firestore | Leaderboard ranking context | No — gameplay result |
| Score history (weekly) | Firestore | Weekly leaderboard calculation | No — gameplay result |
| Score timestamp | Firestore | Weekly leaderboard grouping | No — system clock |
| Games played count | Device only | Ad frequency control | No — gameplay result |
| Per-level best scores | Device only | Level progress display | No — gameplay result |
| Hint count | Device only | In-game hint feature | No — gameplay result |
| Unlocked / completed levels | Device only | Level-select progression | No — gameplay result |
| Ads-removed status | Device only | Suppress ads after purchase | No — purchase result |
| Audio preferences | Device only | Remember music / SFX settings | Yes — in-app toggle |
| Ad interaction data | Google servers | Ad serving & measurement (AdMob) | No — ad SDK |
We do not collect: real name, email address, phone number, precise location, contacts, photos, microphone input, camera data, IP address, or any sensitive personal information.
Your display name and high score are submitted to Firestore to power the global and weekly rankings visible to all players.
Scores, level state, and hints are saved locally so your progress persists between sessions without needing an account.
Google AdMob uses its own identifiers to display relevant ads. Ad frequency is controlled using your locally stored games-played count.
We do not run custom analytics. No usage events, session durations, or crash reports are collected by us directly.
Most of your game data lives exclusively on your device using Android's SharedPreferences key-value store. This data is never transmitted to any server and is only accessible to the Stack Blitz app.
Uninstalling the app removes all locally stored data permanently. You can also clear this data at any time via Android Settings → Apps → Stack Blitz → Clear Data.
Stack Blitz integrates three third-party services. Each operates under its own privacy policy, which we link below.
Generates a random anonymous user ID at first launch. No email, name, or password is ever requested. This ID links your leaderboard entry to future score submissions.
firebase.google.com/support/privacy →Stores your display name, anonymous user ID, high score, level reached, and a weekly score history entry. All records are identified only by the anonymous Firebase UID — never by real identity.
firebase.google.com/support/privacy →Serves banner, interstitial, and rewarded ads. AdMob may collect device identifiers (such as the Advertising ID) and interaction data to personalise or measure ads. See the section below for full details and opt-out options.
policies.google.com/privacy →We do not sell, rent, or share your data with any other third party for marketing, analytics, or any other purpose beyond what is described above.
Stack Blitz displays ads via Google AdMob to support free access to the game. The following ad formats are used:
Google AdMob may use the Android Advertising ID (AAID) and other non-personal signals (device type, OS version, general region) to serve relevant ads and measure ad performance. This data is governed by Google's Privacy Policy.
Ads are shown automatically — interstitials appear roughly every third game session. Rewarded ads are optional and only shown when you choose to watch one to continue after a miss.
Opt out of personalised ads: On Android, go to Settings → Google → Ads → Opt out of Ads Personalisation. You can also reset your Advertising ID from the same menu. Purchasing the optional "Remove Ads" upgrade eliminates all ads entirely.
Stack Blitz is rated Everyone (E) on Google Play and is suitable for all ages. The app does not knowingly collect personally identifiable information from children under 13 (or the applicable age of digital consent in your jurisdiction).
Because Firebase Anonymous Authentication is used — and no email, name, or contact information is ever requested — the app does not collect information that would personally identify a child. All leaderboard entries use a randomly generated display name or a name chosen by the user; no real identity is required.
Google AdMob is configured without child-directed treatment flags, which means ads served to players may not be age-filtered. If you believe your child has provided personal information, please contact us using the details at the end of this policy.
Depending on your jurisdiction (including EEA/GDPR, California/CCPA, and others), you may have the following rights regarding your data:
To exercise any of these rights, please contact us using the details in the Contact section. We will respond within 30 days.
Data is retained for as long as necessary to provide the features it supports:
| Data | Retained Until |
|---|---|
| Display name & high score (Firestore) | You request deletion, or we shut down the leaderboard |
| Weekly score history (Firestore) | Automatically eligible for cleanup after 90 days |
| Anonymous Firebase UID | Linked to Firestore records — deleted when records are deleted |
| All on-device data (SharedPreferences) | Until you clear app data or uninstall |
Firestore data is protected by Firebase Security Rules, which ensure only authenticated sessions (matching the anonymous UID) can write to their own leaderboard entry. Leaderboard data is public by design — display names and scores are visible to all players.
All communication between the app and Firebase is encrypted in transit using TLS. On-device data stored in SharedPreferences is protected by Android's standard app sandboxing and is not accessible to other apps.
Despite these measures, no method of transmission or storage is 100% secure. We encourage you not to use your real name as your leaderboard display name.
We may update this Privacy Policy from time to time to reflect changes in the app's features or applicable law. When we do, we will update the "Last updated" date at the top of this page and, for material changes, notify users via a notice within the app.
Continued use of Stack Blitz after a policy update constitutes acceptance of the revised policy. We encourage you to review this page periodically.
If you have any questions about this Privacy Policy, wish to exercise your data rights, or want to report a concern, please reach out:
Respond time: within 30 days · Language: English
Please replace the email address above with your actual contact email before publishing this page.