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RiverForge

Rain doesn’t go wherever it likes. It rolls to the lowest step it can see — again and again — until it pools.

The whole landscape runs on one rule

Give the land a height at every square, and where the water goes stops being a guess. Water takes the lowest step down, over and over — and that single local rule carves every river, pond, and flood.

💧 Flow & ponds. A drop rolls to its lowest neighbour; a square lower than all four has nowhere to go, so the water pools — a pond.
⛰️ The divide. A ridge splits the rain: one side drains to one pond, the other side to another. The line between is the watershed divide.
🌊 Floods are paths joining. Many squares’ paths merge onto the low ones, so those carry the most water and flood first — not more rain, just more paths meeting.
🧱 Levees move water. Wall off one low spot and the water reroutes to the next — protecting one place can flood another.

Everything runs on your device — no internet, no accounts.

Meet the crew — the shape of a watershed

Divide is the ridge along the top — the line that sends rain on one side to one river and rain on the other to a different one.
Slope is the rule every drop obeys: always take the lowest step down, never uphill.
Channel is where many paths merge into one — the square that carries the most water, and floods first.
Basin is the low pond at the end of the journey, where all the water finally pools.
Delta (mentor) is the wise river-mouth who’s seen where all water ends up, and reminds the crew that a levee doesn’t remove water — it just moves where it collects.

Painted friends + storybooks are coming soon.