Each cone is a village; the tall gold tower is the district hub — the market town every settlement wants a route to. Click one village then another in the 3D scene to build a connection of the currently selected type.
A connection isn't priced by straight-line distance alone. The engine walks the ground between the two villages in 10 steps, reading the real heightmap under the path, and adds a grade penalty for every steep climb or drop — a road across a ravine costs far more than one across flat ground, just like real construction.
Toggle "Show MST hint" to overlay the graph-theoretic Minimum Spanning Tree for the selected infrastructure type — computed with Prim's algorithm over every possible village pair, weighted by the same terrain-aware cost. It's the cheapest possible way to link every village into one network. Compare it with what you actually build: your plan may prioritise a poorer village over the mathematically cheapest one.
A village's brightness and size reflect its quality-of-life score: it rises when the village is linked to the hub — through built infrastructure — by road, electricity and water, each contributing roughly a third. Disconnected villages stay dim and small.