Tarn brings together Basin, a physics game of falling, merging stones, and four level puzzles: Drift, Rake, Bramble and Poise. Every level is generated with a solution, with no lives, no timers and no ads.
Drop stones into a round basin and watch them roll and settle. Two of a size merge into one bigger, from Grit up to a Fell. Keep the rim clear.
A logjam blocks the pool. Slide the logs along their length to float the boat out through the gap, and match the shortest solution for a full cairn.
Swipe the rake across a sand garden. It runs until something stops it and cannot cross raked sand. Comb every square without boxing yourself in.
Vines are tied between stakes in a hopeless tangle. Pull the stakes around until no two vines cross.
A hanging mobile and a tray of stones. Hang every stone so each beam balances: weight times distance has to match on both sides, all the way down.
Twenty levels of every puzzle and three hints a day are free. One purchase unlocks endless levels, unlimited hints, every season and Basin Zen mode. No subscription.
Runs on: iPhone with iOS 15 or later, and Android phones with Android 7.0 or later.
Tarn is made by Dusk Engineering Services Ltd. This policy covers the Tarn app for iPhone and Android. Last updated 2 November 2026.
Tarn does not collect, store or share any personal data. There is no account to create, and the app contains no analytics, advertising or tracking code. Tarn makes no network requests of its own.
Your game progress, settings and whether you own Tarn Plus are saved only on your phone. Deleting the app deletes them.
Tarn Plus is bought through the App Store on iPhone or Google Play on Android. Apple or Google handles the payment and tells the app only whether the purchase is owned; we never see your payment details or your Apple or Google Account. Their own privacy policies cover that purchase.
Tarn is suitable for all ages and collects nothing from anyone, including children.
If this policy changes, the new version will be posted on this page with a new date. Questions: info@duskengineering.services.
Email info@duskengineering.services and we will get back to you.
Restoring Tarn Plus: open Settings in Tarn and tap Restore purchase, signed in with the Apple Account or Google Account you bought it with. It also restores itself automatically when you reinstall.
Free hints: you get three a day across all the puzzles. They refill at midnight on your phone's clock.
Progress: games are saved on your phone only and are not synced between devices.
Refunds for purchases are handled by Apple at reportaproblem.apple.com, or by Google Play from your order history in the Play Store.
Tarn is up and running, with access kept private while we polish it. Leave your email and we will let you know when you can use it.