The Strata of Sunken Caldera
A preliminary survey of the volcanic shelves beneath the Serpentine Rift reveals layered sediment that predates the first Tidemark charts by millennia.
⚡ Field Journal
Tidemark Atlas
A field guide for a fictional ocean-puzzle adventure
Inside the Field Guide
Mechanics of the Tidemark Atlas
A system-by-system breakdown of how the ocean-puzzle adventure works, from tidal logic to community cryptography.
Tidal Cartography
Water levels oscillate on an in-game clock. Reefs, grottos, and collapsed arches block paths at high tide and reveal hidden passages at low tide. The Atlas provides a physical-style chart for players to log their own depth surveys, permanent save-state marks, and tide tables.
Bioluminescent Echoes
Over twenty species of deep-sea fauna emit pattern-based light sequences. Capturing these with the Hydrophone device allows the Atlas to decode them into readable script. This system merges field biology, pattern recognition, and narrative extraction, rewarding patience and careful observation.
Opus of Locks
Nine sprawling puzzle dungeons, each built around a mechanical instrument theme. The Opus system encourages spatial logic and memory. Conquering a lock doesn't just open a chest—it raises a new island from the sea, fundamentally altering the world map. The guide offers dependency trees, not solution keys, preserving the 'aha' moment.
Drift-Bottle Protocol
A fully functional player-driven meta-puzzle. Bottles wash ashore carrying half of a cryptographic key. Decoding a full message requires matching your bottle data with another player’s find. The Atlas hosts the public cipher table, but the cooperation happens organically, making the final endgame reveal a shared community achievement.
Field Notes
From the Atlas Desk
Dispatch logs, cartographic curiosities, and fragments from the world of Tidemark Atlas.
On the Behaviour of Glow-Coral at Depth
Observations from Station Seven suggest that Photopora tentaculata pulses in response to acoustic frequencies generated by the shifting tide gates.
Lost Compass Bearings: The Wicker Excavation
During a routine grid-search of the Wicker Shallows, a corroded surveyor's compass was recovered — its needle frozen at an azimuth not found on any current Tidemark chart.
A Partial Lexicon of the Submerged Cant
Field linguists aboard the Kestrel have catalogued over eighty root-words from the dialect spoken among the floating settlements of the Gyre Archipelago.
Tidal Mapping and the Anomaly at Grid 17-Θ
Automated drift buoys recorded a reversal of the dominant current vector at Grid 17-Θ lasting exactly four minutes and twelve seconds — a phenomenon with no precedent in the existing hydrodynamic model.
Preliminary Notes on the Aviary Caches
Three sealed containers of avian origin have been retrieved from the upper ledges of the Pillars of Isca. Their contents hint at a communication network older than the Tidemark itself.
The Cartographer's Dilemma: When Islands Move
Repeated surveys of the Ravel Atoll confirm a displacement of approximately 40 metres south-southwest over the past three monsoon cycles. The atlas must be drawn in pencil.
A Sundial Reckoning in Perpetual Overcast
The inhabitants of Misthollow have devised a time-keeping method that relies on the directional growth of a bioluminescent moss rather than solar position. A field study in applied chronometry.
Final Transmission from the Meridian Expedition
The last data packet received from the Meridian team includes a single, partially corrupted photograph and an audio fragment that has not yet been fully interpreted.
Manifesto
On Mapping the Uncharted
Tidemark Atlas rejects the fixed grid. It trades perfect cartography for the honest truth of the tide line: every step forward redraws what lies behind. This is a game of navigation without a compass, where puzzles are not locked doors but questions the ocean asks of those willing to listen. The map is your journal. The journal is the game. And the game is never the same water twice.
Common Queries
Frequently Asked Questions
Everything you need to know before setting sail.
What is Tidemark Atlas?
Tidemark Atlas is a first-person ocean-puzzle adventure set among the ruins of ten forgotten civilizations. You play as a cartographer mapping shifting tides and unlocking ancient mechanisms.
Which platforms will the game be available on?
Tidemark Atlas launches on PC (Steam) and macOS. Console versions are under consideration based on demand. A free prologue will be available before the full release.
How long is the main story?
The main narrative spans roughly 8–12 hours, with additional side puzzles and hidden logbooks that can extend playtime to over 15 hours.
Do I need an internet connection to play?
No. Tidemark Atlas is a single-player offline experience. No internet connection is required after installation.
Is there voice acting or text-only dialogue?
The game features atmospheric ambient narration and partial voice acting for key characters. All dialogue is subtitled and available in English, French, German, and Japanese.
Now Available
The Tidemark Atlas Field Guide
Your complete companion to the lost ocean archives. Navigate tides, solve submerged puzzles, and chart the unknown.