Introduction
This Privacy Policy explains how Last Defense: Phòng Tuyến Cuối ("the Game", "we", "our", or "us") handles information when you install, open, and play the Game. The Game is developed and published by BIEXCE Technology Investment & Solutions Company Limited.
Last Defense: Phòng Tuyến Cuối is a single-player tower defense game, and you can play the entire game offline. The Game also includes an optional online leaderboard: to appear on it, you choose a display name (nickname), and the Game submits that nickname together with your game scores and an anonymous, automatically generated ID. The Game does not use user accounts, passwords, social login, or advertising networks.
Information We Collect (Online Leaderboard)
The Game includes an optional online leaderboard. When it is active, the Game collects and uploads the following to our cloud service:
- A display name (nickname) that you choose. This name is shown publicly on the leaderboard. Please do not enter your real name or any personal information as your nickname.
- An anonymous player ID automatically generated by Firebase Anonymous Authentication — a random identifier used only to attach your scores to your entry. It is not linked to your email, phone, or any real-world identity.
- Gameplay scores such as your highest wave, remaining town HP, endless-mode survival time, and total kills.
This information is processed and stored by Google Firebase (Cloud Firestore + Authentication) on our behalf. Your chosen nickname and scores are publicly visible to other players on the in-game leaderboard. See Google's privacy policy at firebase.google.com/support/privacy.
Information We Do Not Collect
We do not request or collect:
- Your real name, email address, phone number, home address, or identity documents.
- Precise location, contacts, calendar, camera, microphone, or photo library data.
- Account passwords, social media profiles, or payment card information.
- Any advertising identifier — the Game shows no ads and does no ad tracking.
Local Gameplay Data
The Game saves limited gameplay information locally on your device so it can work as expected. This may include:
- Current wave progress and the highest wave reached.
- Gold balance, towers built (positions and upgrade levels), and skill cooldown state.
- Collection unlock states — which zombies you have encountered.
- Basic settings such as audio mute state.
- Other non-personal progress values required for normal gameplay.
This local gameplay data is stored on your device. Apart from the leaderboard information described in Section 2, it stays on your device. We do not use it to contact you, track you across other apps, or build an advertising profile.
Permissions
Last Defense: Phòng Tuyến Cuối requests only the minimal permissions it needs:
- Internet / network access — to submit and load the online leaderboard via Firebase.
- Vibration — for optional haptic feedback during gameplay.
It does not request camera, microphone, contacts, precise location, or photo library access, and it does not use an advertising ID.
Ads, Analytics, and Tracking
Last Defense: Phòng Tuyến Cuối does not show advertisements, does not use an advertising ID, and does not perform behavioral or cross-app tracking.
The Game uses Google Firebase (Authentication + Cloud Firestore) solely to operate the online leaderboard described in Section 2. Firebase acts as our data processor for that feature. We do not sell your information and do not share it with advertisers.
Game Assets and Audio
The Game uses local visual and audio assets bundled inside the build, including background music, button sound effects, gameplay sound effects, tower and zombie sprites, UI artwork, menus, popups, and the app icon. These assets are used solely to provide the gameplay experience.
Some audio assets (such as background music or sound effects) may be sourced from royalty-free or licensed audio libraries (for example, Pixabay). These audio files are bundled locally with the Game build and are not used to collect, transmit, or analyze player information.
Children's Privacy
Last Defense: Phòng Tuyến Cuối is a general audience game with cartoon visuals and does not knowingly collect personal information from children. The Game does not require registration or personal details. Because the leaderboard shows a nickname that the player types in, we ask that players do not use real names or any personal information as their nickname.
If you believe that a child has provided personal information to us, please contact us using the email below so we can review and address the issue.
Data Retention and Deletion
Local gameplay data remains on your device until you clear the Game's app data, reset your device, or uninstall the Game. Uninstalling the Game normally removes locally stored gameplay data from your device.
Leaderboard data: your nickname and scores stay on our Firebase leaderboard until they are removed. Changing your nickname in-game replaces the previously shown name, and the in-game reset removes your local save. To request deletion of your leaderboard entry, contact us at the email below and we will remove it.
You can also clear local data from Android's Settings → Apps → Last Defense → Storage → Clear Data.
Security
Leaderboard data is transmitted over encrypted HTTPS connections to Google Firebase. We keep the collected data minimal — a nickname you choose, an anonymous ID, and game scores — so the privacy impact stays low.
We strive to keep the Game simple, secure, and respectful of player privacy.
Changes to This Policy
We may update this Privacy Policy if Last Defense: Phòng Tuyến Cuối adds new features, online services, advertising, analytics, cloud saves, leaderboards, account systems, or other data-related functionality.
When changes are made, the "Last updated" date at the bottom of this page will be revised accordingly.