# Fathom: Sonar Puzzle — Chart Hidden Paths in the Dark

> Chart Hidden Paths in the Dark (iPhone/iPad app by NovoBuild LLC.)

- Source: https://appshunter.io/ios/app/fathom-sonar-puzzle/id6798242907 (this page in markdown: same URL + `.md`)
- Developer: [NovoBuild LLC](https://appshunter.io/developer/1784126512)
- Category: Games, Puzzle, Strategy
- Price: $1.99
- Age rating: 4+
- Requires: iOS 17.0 · 88 MB
- Languages: American English
- Released: 2026-08-20
- Data updated: 2026-09-06
- User reviews in markdown: https://appshunter.io/ios/app/fathom-sonar-puzzle/id6798242907/reviews.md

## What is Fathom?

Chart what the dark won't show.

Fathom is a quiet sonar logic puzzle about deciding how much the next answer is worth. Explore a hidden grid one edge at a time, find each objective, and complete the mission using as little Intel as possible.

PROBE THE UNKNOWN
Test an unexplored direction for one Intel. An open route lets you move. A wall becomes part of your permanent chart. Once a corridor is known, traveling through it is free.

CHOOSE YOUR SIGNAL
Spend two Intel on a focused Sonar glimpse, or commit five to a wider Deep Pulse. More information can save a run—but only if it was worth the cost.

THREE WAYS TO PLAY
• Campaign: Twelve named missions introduce the rules and combine them in new ways.
• Daily Dive: Complete a fresh Easy, Medium, and Hard sequence each day.
• Free Dive: Generate another seeded chart whenever you want a new puzzle.

THREE MISSION FAMILIES
• Echo Hunt: Follow distance and bearing to a hidden beacon.
• Relay Chain: Reach multiple relays in the correct order.
• Sector Survey: Visit every marked objective and turn uncertainty into a map.

PLAY AT YOUR OWN PACE
There is no timer and no move limit. Fathom rewards observation, memory, and efficient decisions. Finish a mission, study the revealed chart, then return to lower your Intel score and improve your grade.

• No ads
• No subscriptions or in-app purchases
• No account required
• No analytics or tracking
• Progress stored on your device
• Left- or right-handed controls
• Designed for landscape play on iPhone

Move cheaply. Scan wisely. Learn the dark.


## Version history (last 1 release)

### 1.0 — 2026-08-20

No release notes.

## More apps by NovoBuild LLC

- [Stonegate: The Mad Baron](https://appshunter.io/ios/app/stonegate-the-mad-baron/id6788900593)
- [LeanSignal](https://appshunter.io/ios/app/leansignal/id6791556289)
- [CashSpan](https://appshunter.io/ios/app/cashspan/id6791994565)
- [Lastmark: When Did I Last?](https://appshunter.io/ios/app/lastmark-when-did-i-last/id6792133215)

All apps by NovoBuild LLC: https://appshunter.io/developer/1784126512

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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 2026-09-06.*