# Ozvenka: Echo Deduction — Listen. Deduce. Never guess.

> Listen. Deduce. Never guess. (iPhone/iPad app by Web 3.0 s.r.o..)

- Source: https://appshunter.io/ios/app/ozvenka-echo-deduction/id6811311501 (this page in markdown: same URL + `.md`)
- Developer: [Web 3.0 s.r.o.](https://appshunter.io/developer/1896271989)
- Category: Games, Board, Puzzle
- Price: Free
- Age rating: 4+
- Requires: iOS 15.0 · 2 MB
- Languages: American English
- Released: 2026-09-13
- Data updated: 2026-09-14
- User reviews in markdown: https://appshunter.io/ios/app/ozvenka-echo-deduction/id6811311501/reviews.md

## What is Ozvenka?

Ozvenka is a quiet logic puzzle about listening.

The cave is dark. Stones lie somewhere inside it and you will never see them. You put nothing into the cave — you send an echo in from the edge and listen for where it comes out. Either it appears somewhere else, or a stone swallows it, or it returns the way it went. From what you hear, where the stones lie can be worked out. Not guessed. Worked out.

• 120 caves across ten worlds, plus a daily cave — one a day, the same one for everyone
• Every cave's par is the smallest possible number of echoes. It is not the author's estimate: the same solver that verified the cave computes it
• You never have to guess: every cave has exactly one answer, and the echoes can always settle it
• When you get it wrong, the game says why: whether an echo contradicts your reading, or whether you simply have not heard enough yet
• The hint is computed from what you have actually heard. It never points at something that is not in the cave
• Once you solve it, you see where the echoes really went
• Slovak, English and Czech

No ads. No in-app purchases. No accounts, no sign-in.

And no internet: every cave and every daily is inside the app, so it plays on a plane. Nothing about you is collected or sent anywhere — the statistics stay on your phone.


## Version history (last 1 release)

### 1.0 — 2026-09-13

No release notes.

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All apps by Web 3.0 s.r.o.: https://appshunter.io/developer/1896271989

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-14.*