Mercuro: Thermometers Puzzle

Fill the heat. Mercuro is the thermometers logic puzzle: fill every tube with mercury from the bulb up until every row and column count matches its clue. Pure deduction, no guessing, every board has exactly one solution.

CALM, PURE LOGIC
A quiet brain workout in 5 minutes or 50. No timers chasing you, no lives, no pressure. Just you, the clues, and a board that always plays fair.

600+ HANDCRAFTED PUZZLES
300+ free puzzles across 8 board sizes, from quick 5x5 warm-ups to deep 12x12 thinkers. Every single one is hand-checked for a unique, satisfying solve. Mercuro Pro doubles the game with 300+ more in the Kelvin chapters.

3 NEW PUZZLES EVERY DAY
A fresh daily set each morning: Warm-Up, Daily, and Challenge. Keep your streak alive and revisit the last two weeks in the archive.

MAKE IT YOURS
9 handcrafted themes, from riso-print paper to calm glacier blue. Earn them by solving, or unlock them all instantly with Pro.

COMPETE AND COLLECT
Game Center leaderboards, 40 achievements, and a rank ladder from Novice to Virtuoso.

PLAYS ANYWHERE
Fully offline. iPhone and iPad. Progress syncs through iCloud.

FAIR PRICING, NO SUBSCRIPTION
The free game is complete: 300+ puzzles plus the daily set, forever. One optional one-time purchase removes ads and unlocks everything. That is it.