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Mercuro
Fill the thermometers to match the clues. A quiet, sudoku-adjacent logic game. No timers, no lives to wait for, and nothing behind a paywall.
- Platform
- iPhone, iPad, Mac, Vision · App Store · Android in closed testing
- Content
- 660 curated puzzles across 8 board sizes · 3 daily games · 40 achievements · 9 themes
- Model
- Free game, complete · $4.99 one-time Pro, $2.99 remove ads · no subscription
- iOS stack
- Pure SwiftUI (no game engine), Swift 6 strict concurrency, GameKit, StoreKit 2
- Android stack
- Native Kotlin + Jetpack Compose, pixel-parity port
Gameplay and UX
The game engine. Its own puzzle mathematics. A constraint solver that proves every board has exactly one solution, a generator that searches for boards with clean deduction chains, and a seeded random core so the whole world gets the same three daily games without a server round-trip.
The hint system. It does not fill a cell for you. It finds the next move that is provable from what is already on the board, so a stuck player keeps going instead of losing the puzzle.
The polish. Nine themes, custom sound design, haptics on every commit, 40 achievements and a rank ladder, Game Center leaderboards, and offline play with iCloud sync. Built natively twice, SwiftUI on iOS and Kotlin with Compose on Android, against one shared puzzle core down to pixel-parity screenshot tests.