Privacy Policy for One Line Train

Last updated: November 2026

This privacy policy explains how One Line Train (“the app”), made by JL Prime (“we”), handles information. Short version: there is no sign-up, and we don't ask for your name, email, contacts or location. The app uses Google Firebase for gameplay analytics and crash reports, and shows ads through Google AdMob (some of those ads may come from Unity Ads through AdMob). These services use random IDs and device data, as explained below.

Your game data

Your game save (levels cleared, stars, perfect runs, coins, hints, shop items you own and use, Gold Line and Endless progress and best scores, an active ad-free hour, and your sound and vibration settings) is stored on your device. We don't receive this save file, although the analytics described below include some game numbers, such as your level and score.

Your phone's own backup may keep a copy: Android's backup to your Google account (if backup is turned on), and iCloud or computer backups on iOS. Those copies are handled by Google or Apple, and we can't see them. You can manage them in your device settings.

Uninstalling the app deletes the save from your device.

Analytics and crash reports (Google Firebase)

To understand how the game is played and to fix problems, the app uses:

• Firebase Analytics: records gameplay events such as starting, finishing or restarting a level, stars earned, using a hint, playing Endless or a Gold Line ride and the score, spending coins in the shop, and watching a rewarded video. These come with general device information (model, OS version, country) and a random app-instance ID, not your name. Individual taps and the lines you draw are not recorded.
• Firebase Crashlytics: if something goes wrong in the app, sends a crash report (technical details such as the stack trace, device model and OS version) with a random installation ID, so we can fix the bug.

Google's Firebase privacy information: firebase.google.com/support/privacy

Advertising (Google AdMob and Unity Ads)

The app uses Google AdMob to keep the game free. It shows a small banner below the game, an occasional full-screen ad when you go on to the next level (never in the middle of a puzzle, and not in the first levels), and optional rewarded videos. Rewarded videos are always your choice: for a hint, to open the next level when you're stuck, or for an hour with no banner or full-screen ads. To deliver and measure ads, AdMob may collect and process:

• Device identifiers, such as the Android Advertising ID, or on iOS the Identifier for Advertisers (IDFA) if you allow tracking
• IP address (used to estimate general location, like country)
• Information about ad interactions (for example, ads viewed or tapped)
• Diagnostic information about the ad SDK (crashes, performance)

On iOS, the app may ask whether it can track you to show more relevant ads. If you choose “Ask App Not to Track”, the IDFA is not used and ads are not personalized using cross-app tracking. You can change this at any time in Settings → Privacy & Security → Tracking.

If you are in the European Economic Area, the UK, or Switzerland, the app asks for your choices using Google's consent tool before ads are personalized. You can change your ad choices at any time in the game's Settings → Privacy choices.

The app asks Google not to show ads rated above Teen.

AdMob may also fill some ads from Unity Ads (Unity Technologies), through AdMob mediation. When it does, Unity's ad SDK may collect and process similar data to deliver and measure the ad, under the Unity privacy policy.

Google's use of this data is described in its policies:

• How Google uses information from apps that use its services
• Google Privacy Policy

You can reset your advertising ID or opt out of personalized ads in your device settings:

• Android: Settings → Google → Ads
• iOS: Settings → Privacy & Security → Apple Advertising

In-app purchases

The app has no in-app purchases. Coins are earned by playing, can't be bought, and have no real-world value.

If you email us

If you contact support, we receive your email address and whatever you write. We use them only to reply and help you.

Children

The app is not directed at children under 13, and we do not knowingly collect personal information from children. If you believe a child has provided personal information through the app, contact us and we will help remove it.

Changes to this policy

We may update this policy from time to time. Changes will be posted on this page with a new “Last updated” date.

Contact

Questions about this policy: support@jlprime.com.sg