Supported Features
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Dark Interface
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Reduced Motion
Fathom: Sonar Maze
Hidden Path Deduction Puzzle
Only for iPhone
$1.99
iPhone
Explore a hidden maze without seeing its walls. Probe carefully, use Sonar when you are stuck, and earn an S grade by spending less Intel. $1.99, no ads.
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
Can you chart every objective with fewer pings?
Fathom now includes a dedicated layout for iPhone Duo. The chart and controls adapt as the window changes size, menus can scroll on narrower screens, and your dive stays in progress as you open or close the device. The regular iPhone layout remains unchanged.
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.
The developer indicated that this app supports the following accessibility features. Learn More
Information
- Seller
- Novobuild LLC
- Size
- 92.5 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
