App Support — Hollowping

Get help with Hollowping, the cave-sonar moth puzzle.

Hollowping is an iOS and Android puzzle: you are a lost moth in a pitch-black cave. Send out a sonar ping, watch the walls flash for a moment, and fly to the roost. It has 74 caves in eight worlds, a Daily Cave with a streak, an endless Drift mode, a Moth Cabinet of 24 moths you unlock with coins you earn by playing, is free to play with ads, has no accounts, and works offline. Questions? Write to bpupadhyaya@equalinformation.com.

Frequently Asked Questions

Is Hollowping free?

Yes. Hollowping is free to play, with ads served by Google AdMob: a banner on the home screen and below the cave, and a full-screen ad after some completed caves. You can earn ad-free play each month by watching short videos, or go ad-free every month with an optional monthly subscription.

How do I play?

Drag anywhere and the moth flies toward your finger; tap the ping button (or tap the cave) to send a sonar ring. Rock the ring reaches flashes and fades, so you read the cave a little at a time. Moss swallows sound and never lights up, glass lets sound pass but not the moth, an echo door opens the first time an echo reaches it, and fireflies are optional pickups that give coins. Fewer pings earn more stars (three stars at par). Retry is free and there are no timers and no lives.

How do I earn ad-free play each month?

Open Ad-free from the menu and watch short rewarded videos. A progress bar shows how many videos you have watched this month and the date it resets. Reaching the goal turns ads off until that date. Watching is always your choice.

What does the monthly subscription cost, and how does it renew?

Ad-free Monthly is US$2.99 per month (local price shown in the store). It renews automatically every month until you cancel, and it removes ads for as long as it is active.

How do I cancel the subscription?

iPhone and iPad: Settings > your name > Subscriptions > Hollowping > Cancel Subscription. Android: Google Play > Profile > Payments & subscriptions > Subscriptions > Hollowping > Cancel subscription. Deleting the app does not cancel it.

How do I restore my subscription?

Open Ad-free in the app and tap Restore purchases. You need to be signed in to the same Apple ID (iPhone and iPad) or Google account (Android) that subscribed.

Does the game work without internet?

Yes. The game plays fully offline; only ads and subscription checks need a connection.

Is my data private?

The app has no accounts and no servers of ours, and your progress stays on your device. It shows ads served by Google AdMob, which may use your advertising ID. Where the law requires it the app shows Google’s consent form, and on iPhone and iPad it asks permission through Apple’s App Tracking Transparency prompt. See the Privacy Policy.

Which terms apply?

Apple’s standard Licensed Application End User License Agreement on iPhone and iPad, and the Google Play Terms of Service on Android.

My progress is missing. What should I do?

Progress is stored on your device, so it does not carry over to a new device or after an uninstall.

How do I contact support?

Email bpupadhyaya@equalinformation.com and tell us your device, the app version and what happened.