Fathom: Sonar Puzzle
Chart Hidden Paths in the Dark
Only for iPhone
$1.99
iPhone
Probe hidden routes, choose between focused Sonar and a wider Deep Pulse, and finish each mission using as little Intel as possible.
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.
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The developer, NovoBuild LLC, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Novobuild LLC
- Size
- 92.3 MB
- Category
- Puzzle
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 NovoBuild LLC
