Epoch Lanterns

Guide one settlement through three eras and light all three heritage lanterns within twelve seasons. Blue river and green forest tiles cannot be built on. Choose Farm (2 wood) and place beside the river, Mill (2 food) beside forest, or School (3 wood) beside the central settlement. Every successful construction, era advance or lantern lighting runs one season: population eats food equal to the current era, then each farm yields 2 food, each mill 2 wood, and each school 2 knowledge. Starvation is checked before the harvest. Advance to era 2 for 3 wood + 3 knowledge; era 3 costs 4 wood + 6 knowledge. Only era 3 can light the three corner lanterns, each for 1 food + 2 knowledge. Build an economy before increasing upkeep. Invalid sites and unaffordable purchases cost nothing. Keyboard: Tab and Enter/Space operate buttons; R restarts.