Tidemark

You inherit a silent chartroom at the edge of a restless archipelago. Harbor lights have gone dark, old passages have become unreliable, and every connection must be drawn again. Tidemark is a compact route-planning game about reading transparent forecasts instead of following a marked answer. Stack the tide, current, and wind layers over one shared chart, study how they change across the day, and reconnect each forgotten harbor by plotting a route of your own.

Each voyage contains four connected Passages and is designed to take about three to five minutes. Toggle the tide, flow, wind, and reef layers, then drag the time ruler through twelve forecast phases. Place route nodes directly on the chart while watching depth, current direction, headwind, vessel draft, travel time, and hull condition. A shallow shortcut may close at low tide. A following current can save precious time, while a headwind can turn a safe line into a late arrival. Preview runs the same deterministic sampling and voyage rules used by Sail, so the route you test is the route the vessel will attempt. If a voyage fails, the same fixed forecast remains available for an immediate, fair retry.

After every successful Passage, choose one of three Almanac Notes. A Note can extend a safe tide window, print favorable current strength onto route legs, reduce headwind loss, or trade certainty for a stronger reward. Notes change the way you read and manage a forecast; they never draw a route for you and never reveal a complete solution. Efficient routes earn Route Wax for tactical redraws and voyage tools. Completing a full voyage awards Harbor Stamps, repairs the chartroom, opens new island branches, and records the harbor you personally reached.

The long voyage spans four island chains, forty planned voyages, forty-eight collectible Harbor Log pages, twelve chartroom workbenches, and eight small vessels with different draft, speed, and headwind handling. Each island chain culminates in a Spring Convergence, where inherited tide phases, crowded forecast layers, and limited Preview uses turn everything you have learned into one demanding crossing.

Advertising is always optional and player initiated. Rewarded ads can provide limited recovery or faster progress through daily stamps, a free Almanac redraw, a voyage restore, or doubled report stamps. Ads never plot routes, reveal answers, or impose an energy system. Tidemark does not use device location or live weather data. Patterns, arrows, labels, color-safe state changes, and optional haptics preserve the full rules when sound is muted or color perception differs.

Controls / 操作
Toggle forecast layers, drag the time ruler, and tap the chart to place route nodes. Use Preview to test the exact voyage simulation, Undo to revise the latest node, and Sail when the tide window, travel time, and hull outlook are ready.

Goal / 目标
Reach every destination safely, complete four linked Passages, reconnect all four island chains, and archive all forty-eight forgotten harbors in the Harbor Log.