Sonarium vs Sumhow

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.

Somebody left you a calculator. Most of the keys are gone. Sumhow hands you a target and a handful of surviving keys, and asks you to make the number anyway. Three, plus and times are enough to get started. Then the machine starts changing the rules on you. HOW IT PLAYS • Every unit has a par: the fewest presses it can possibly be done in. Match it for three stars. • The machine resolves left to right, with no order of operations. On this unit, 3 + 4 × 2 is 14. • Undo and Clear are free, so experiment. There are no timers, no lives and no fail state. TEN CHAPTERS, ONE RULE EACH Roots, where √ only lands on whole numbers. Echo, where equals repeats the last operation. Decay, where the × key dies after two uses. Stutter, Memory, Wraparound, The Toll, Below Zero, Blind. And Word Mode: ninety-six trivia questions whose answers you spell by typing the number that reads as the word when the screen is upside down. The first four chapters are free. Each of the ten that follow is a single purchase, or earn it: every unit in a chapter at three stars pays for the next one in gold. HINTS THAT COST SOMETHING A nudge shows your next press. A route shows the whole solution. Both cost gold and cap the stars you can earn on that unit, so a hint is a choice, not a shortcut. SKINS Wear the calculator you want. Forty-three skins in seven packs, from leopard print to a synthwave sunset, tried on before you buy. THE QUIET PART The unit reacts to certain numbers. None of them are listed. Scratch mode is a fully working calculator with no target; that is where you go looking. Find enough and a chapter opens that is not for sale. No ads. No account. No energy meter. Just a calculator with a problem, and you.