Furnace

Lore & Background

In the alien world the player has landed upon, iron ore lies exposed in rust-red veins across the terrain, and grey stone boulders dot the landscape. But neither is useful in its raw form. The furnace—first a crude stone-brick box, later a sleek steel unit, and ultimately a humming electric appliance—embodies the fundamental act of industrial civilization: imposing human (or player) will upon inert matter through controlled energy. The progression from Stone to Steel to Electric furnace mirrors the broader arc of the game. The Stone Furnace is barely more than a kiln, limited and fuel-hungry, demanding that the player hand-feed coal and watch each plate emerge one by one. The Steel Furnace doubles the throughput and feels like a genuine leap forward. The Electric Furnace, however, signals a threshold: the factory is no longer a collection of isolated workshops but a networked system where power flows through cables and the furnace is just another consumer on the grid. That shift in mindset—from fuel to electricity, from standalone to interconnected—is arguably the most important conceptual transition in the early game. Fans often romanticize the first furnace. There is something deeply satisfying about placing a single stone furnace next to a mining drill, watching the little progress bar fill, and hearing that first soft *clink* of an iron plate dropping into the output slot. It is the moment the world stops being a resource map and starts being a factory.

In Their Own Story

The dust had barely settled from the mining drill's first full rotation when the player crouched beside the freshly placed stone furnace, a coal chunk already loaded into its side slot. Around them, the alien plain stretched flat and rust-coloured, broken only by the grey boulders they had spent the last twenty minutes punching with a pickaxe. They dropped the coal in. The furnace shuddered, a faint orange glow bleeding through the gaps in its stone casing. Somewhere deep inside, a small flame caught and held. The progress bar—thin, patient, almost mocking in its slowness—began to creep forward. One. Two. Three seconds. Then a soft metallic *tink* as the first iron plate slid out, warm and faintly pitted, catching the low alien sunlight. The player picked it up, turned it over in their gloved fingers, and felt something click into place that no tutorial text had prepared them for. The factory had a heartbeat now. And it was going to need a lot more coal.

Reader's Guide

The furnace handles two core recipes. Iron Ore (mined by a Mining Drill) plus Coal (also mined) yields one Iron Plate. Stone (mined) plus Coal yields one Brick. The required machine is any furnace variant; the Stone Furnace is available almost immediately, the Steel Furnace requires a Steel recipe, and the Electric Furnace requires a working power grid. Upstream, you need at minimum two mining drills (iron ore, coal) and one for stone if you want bricks. The fuel chain is simple: coal is mined directly, no intermediate processing. Downstream, iron plates feed into Steel, Iron Gear Wheels, Electronic Circuits, and virtually every other crafted item. Bricks feed into Stone Foundations and decorative walls. The bottleneck in the early game is almost always the furnace itself—its 1.33/s (Stone) or 2/s (Steel/Electric) smelting rate limits how fast plates appear. As the factory scales, the constraint shifts to fuel supply (coal mining) or, for Electric Furnaces, available kilowatts. A common early ratio is roughly one Mining Drill per furnace, but once you need more than a dozen plates per second, you will want to parallelize: multiple drills feeding multiple furnaces, or upgrade to Steel/Electric variants to double per-unit throughput. Scaling tip: the furnace chain is linear (1 ore → 1 plate), so there is no hidden multiplier to manage. The real scaling challenge is logistics—getting ore and fuel to each furnace without belt congestion. Group furnaces in rows of four to six with a single input belt and a shared output belt to keep the layout clean as the factory grows.

Did You Know?

• The Stone Furnace is one of the very first machines available in the game, making it the gateway from raw resource gathering to actual manufacturing.
• The Electric Furnace consumes no fuel at all; its only input is electricity, which means it can run indefinitely as long as the power grid holds, eliminating the need to mine coal for smelting.
• The furnace is the only machine in the base game that processes both iron ore and stone, making it a dual-purpose workhorse in the early game.
• The progression Stone → Steel → Electric furnace mirrors the game's broader shift from fuel-based to electricity-based infrastructure, a transition that reshapes the entire factory layout.