Sonarium: Sonar Puzzle

One rule: every number on the grid is an echo — how many steps, up, down, left or right, to the nearest thing hiding below. Mark everything down there, and the sea shows you what you've found.

Sonarium is a logic puzzle played in the dark. No guessing, ever: every puzzle has exactly one solution, and every step can be reasoned out. When the shape closes, the screen lights up — a whale, a shipwreck, something stranger — and the find goes into your Field Guide.

THE VOYAGE
• Four voyages, sixteen seas, 160 charted puzzles — grids grow from 8×8 to 15×15
• The work deepens as you go: sparser echoes, bigger boards, and later, readings that lie. Put three clues side by side; one won't add up. Catch it.
• More than 160 discoveries to log, each with a line from the sonar operator's journal
• A few finds hide off the route — the question marks in the guide are for the sharp-eyed
• A story told between the puzzles: an echo too regular to be an animal has been following your ship since the first sea

ONE SEA, EVERY DAY
• Daily Scan: one puzzle a day, the same grid for every player in the world
• Keep your streak on the Crew Certificate; share your result without spoiling a single cell
• On special scan days, the daily becomes a patrol — and what you find there gets its own page in the guide

The first voyage is free. Beyond it, any voyage marked "Open for a limited time" is yours to sail straight through for as long as the mark is there; without the mark, one purchase of the Full Version opens all the rest — no subscription, no chapters sold piecemeal.

No ad ever interrupts a puzzle. The only ad in the game is an optional video for an extra daily rescan. No account, no sign-in — progress stays on your device, and the whole game works offline.

The sea is waiting. Cast off.