Factorio is the factory-building game that has ruined sleep schedules since 2016. You crash-land on an alien planet and must build increasingly complex automated factories to launch a rocket and escape. What starts as hand-mining iron ore evolves into continent-spanning logistics networks with trains, robots, and nuclear power. The 'one more belt' addiction is real — optimizing production ratios, throughput bottlenecks, and logistics creates a satisfaction loop that few games match. The 2.0 update and Space Age expansion added space platforms, new planets, and elevated rails, extending the endgame dramatically.
This guide covers everything you need: core mechanics, the best builds, equipment worth investing in, location progression, and the tips that actually make a difference.
Core Mechanics
belt logistics
Transport belts are the backbone of factory logistics, moving items at three speeds: yellow (15 items/s), red (30 items/s), and blue (45 items/s). Belts have two lanes and can be split, merged, and filtered using splitters. Underground belts tunnel beneath obstacles, and belt balancers ensure even distribution. Understanding belt throughput limits is the first major skill.
circuit networks
Red and green circuit wires connect machines, allowing conditional logic. You can read belt contents, control inserter behavior based on inventory levels, and create complex conditional systems. Example: stop an inserter when storage exceeds 200 iron plates, or activate a train signal when a fluid tank is below 50%. Circuit networks enable truly intelligent factories.
train systems
Trains transport bulk materials over long distances faster than belts. They use signals (chain and regular) for intersection safety, and schedules define their routes. Proper train signaling prevents deadlocks. Trains enable the City Block design pattern where each factory block is train-supplied, creating modular, scalable bases.
nuclear power
Nuclear reactors use Uranium-235 fuel cells to generate massive power (160MW per reactor pair with neighbor bonus). The fuel cycle involves mining uranium ore, processing it in centrifuges (0.7% chance of U-235), enriching with Kovarex process, and managing used fuel cells. Nuclear is complex to set up but provides endgame-scale power.
biome defense
Biters (alien bugs) attack your factory based on pollution level. Evolution factor increases with time, pollution, and nest destruction, spawning stronger biter variants. Defense involves walls, turrets (gun, laser, flamethrower), and artillery for offensive nest clearing. Pollution management (efficiency modules) reduces biter aggression.
Builds Overview
| Build | Tier | Playstyle | Key Stats |
|---|---|---|---|
| Main Bus | S | Build a straight highway of core resources, branch off production lines at 90 degrees, and expand the bus when you need more throughput. | Belt throughput, bus width (4 belts per resource), assembler ratios |
| City Block | S | Design a standard block size (e.g., 100x100 tiles), create a rail grid, and stamp down production blocks for each product. Scale by adding more blocks. | Train throughput, block size standardization, intersection design |
| Spaghetti | B | Build whatever you need wherever there's space. When something stops working, add more belts until it does. Embrace the chaos. | Does it work? Then it's fine. |
| Train World | A | Build mining outposts at remote ore patches, lay rail networks between them and your main base, and manage train schedules to keep everything supplied. | Train scheduling, signal placement, stacker designs for loading/unloading |
| Death World | A | Build compact, heavily defended bases. Rush military science for better turrets. Use efficiency modules to reduce pollution (which triggers biter attacks). Clear nests with artillery before expanding. | Military tech priority, pollution management, wall coverage |
Main Bus (S-Tier): The Main Bus design runs 4-8 lanes of core resources (iron plates, copper plates, green circuits, steel, stone) in a straight line. Production branches off the bus using splitters. This is the most recommended first-playthrough design because it's organized, scalable, and easy to understand. A 4-wide iron bus with 4-wide copper bus handles early and mid game comfortably.
City Block (S-Tier): City Block designs divide the factory into identical-sized squares connected by a train grid. Each block produces one product, receives inputs by train, and ships outputs by train. This is the most scalable design — need more green circuits? Just stamp down another green circuit block. Requires solid train signaling knowledge.
Spaghetti (B-Tier): Spaghetti is what happens organically when you build without a plan — belts weaving around each other in chaotic tangles. While inefficient, many experienced players argue that spaghetti is the most fun way to play because it forces creative problem-solving. Your first factory will probably be spaghetti, and that's okay.
Train World (A-Tier): Train World settings increase resource patch distances, forcing heavy reliance on trains for everything. Remote mining outposts ship ore to centralized smelting arrays. This is the intended endgame design pattern and teaches critical train signaling skills. Beautiful to watch when running smoothly.
Death World (A-Tier): Death World is a map setting that maximizes biter aggression — high evolution, frequent attacks, and dense nests. It transforms Factorio into a tower defense game where military production is as important as science. Requires flame turrets, walls, and eventually artillery to survive. Extremely challenging but rewarding.
For full build breakdowns with gear and stat priorities, see our Factorio builds guide.
Equipment Guide
| Equipment | Why It Matters | Best For |
|---|---|---|
| Rocket Launcher | The personal rocket launcher fires explosive rockets in an arc, dealing heavy AoE damage. | Death World |
| Flamethrower Turret | The most efficient static defense in the game. | Death World |
| Laser Turret | Laser turrets draw power from your electricity grid and fire automatically at enemies. | Main Bus |
| Artillery | Artillery turrets and wagons fire massive shells at extreme range (up to 7 chunks), automatically targeting biter nests. | Train World |
| Atomic Bomb | The ultimate weapon — a nuclear warhead fired from the Spidertron or rocket launcher that annihilates everything in a massive radius. | Death World |
Rocket Launcher: The personal rocket launcher fires explosive rockets in an arc, dealing heavy AoE damage. Essential for clearing biter nests before you unlock artillery. Each rocket costs 4 explosive rocket fuel + 2 electronic circuits to craft. Bring 50+ rockets for a nest-clearing expedition.
Flamethrower Turret: The most efficient static defense in the game. Flamethrower turrets deal massive AoE damage over time and are incredibly cost-effective. They require pipe connections to a fluid source (light oil or crude oil). Place them behind walls with a gap so flames reach over the wall. One row of flamethrowers handles virtually any attack.
Laser Turret: Laser turrets draw power from your electricity grid and fire automatically at enemies. No ammo needed but they consume significant electricity — 24MW during sustained fire. Best used as a secondary defense layer behind flamethrower turrets. The lack of ammo logistics makes them convenient for remote outposts.
Artillery: Artillery turrets and wagons fire massive shells at extreme range (up to 7 chunks), automatically targeting biter nests. This is the endgame solution for base expansion — the artillery clears nests before they become a threat. Artillery wagons on trains create mobile bombardment platforms.
Atomic Bomb: The ultimate weapon — a nuclear warhead fired from the Spidertron or rocket launcher that annihilates everything in a massive radius. Each bomb requires uranium-235, explosives, and rocket fuel. Use sparingly because it destroys your own structures too. One bomb clears an entire biter base cluster.
Location Progression
| Location | Level Range | Key Rewards |
|---|---|---|
| Starting Area | First 2-4 hours | First iron/copper patches, starting base location, initial research completion |
| Oil Fields | Mid game (4-8 hours) | Petroleum gas (plastic, sulfur), lubricant (blue belts, robots), light oil (flamethrower fuel) |
| Uranium Patch | Late game | Nuclear fuel (fastest train fuel), nuclear reactor power (160MW per pair), atomic bombs, uranium ammo |
| Enemy Bases | All game phases | Safe expansion territory, reduced attack frequency, alien artifacts (in modded games) |
| Rail Network | Mid-Late game | Bulk material transport, scalable logistics, City Block factory design |
Starting Area: The area cleared of biter nests around your spawn point. Size depends on map settings. Contains your initial iron, copper, and stone patches. Build your starter base here with basic smelting, science production, and your first mall (automated crafting of belts, inserters, assemblers).
Oil Fields: Oil is found in pumpjack-mineable patches, usually at moderate distance from spawn. Oil processing is the first major complexity spike — you must handle three fluid outputs (heavy, light, petroleum) simultaneously. Build your oil processing at the oil field or pipe it home.
Uranium Patch: Uranium ore patches require sulfuric acid piped to the miner to extract. Uranium processing involves centrifuging ore into U-238 (99.3%) and U-235 (0.7%), then using Kovarex enrichment to convert U-238 into more U-235. The patch is usually far from spawn and requires rail infrastructure.
Enemy Bases: Biter nests cluster in groups called bases. They expand toward your pollution cloud and spawn attack waves. Clearing them requires military force — personal weapons for small bases, artillery for large ones. Cleared territory provides safe expansion space but nests regenerate near pollution sources.
Rail Network: Your rail network is the circulatory system of a large factory. Well-designed rail networks use standard intersection blueprints, proper signaling, and dedicated loading/unloading stations. The rail network connects remote resource patches to your main base and enables the City Block design pattern.
Tips That Actually Matter
- The ratio for Red Science is 1 assembler each for copper plates → gears → red science. For Green Science, you need 6 inserter assemblers per 5 belt assemblers per 1 green science assembler. Use a ratio calculator for complex recipes.
- Always leave space between production lines. The number one regret of new players is building too tightly — you will need to expand every line as demand increases.
- Flamethrower turrets behind dragon's teeth (alternating wall segments that slow biters) create the most cost-effective defense in the game. One row handles even behemoth biters.
- The Spidertron (late-game personal vehicle) walks over obstacles, fires rockets, and can be remote-controlled or follow you in groups. Build a squad of Spidertrons for automated nest clearing.
- Efficiency 1 modules are the best pollution reduction per cost. Stuffing them into mining drills dramatically reduces pollution and biter attack frequency, especially on Death World.
- Blueprint strings can be shared online and imported into your game. Search 'Factorio blueprint book' for community-designed balancers, smelting arrays, and train intersections that save hours of design work.
- Nuclear power's neighbor bonus means a 2x2 reactor setup produces 480MW (160MW per reactor × 3 from neighbor bonus). This single setup powers a massive mid-game base.
- Logistic robots handle complex item routing that belts struggle with — use them for mall distribution (delivering belts, inserters, assemblers to your inventory) while keeping main production on belts.
- The Map Editor lets you preview potential base locations before committing to a map. Look for a spawn with iron, copper, stone, and coal within reasonable distance, plus water for steam power.
- After launching your first rocket, the real game begins — optimizing SPM (science per minute). Megabases producing 1000+ SPM are the community's endgame challenge and require completely rethinking your factory design.
Common Mistakes to Avoid
- Building production too close together without leaving expansion room — you WILL need to rebuild and expand every line multiple times.
- Ignoring the main bus design and creating isolated production islands that can't share resources — this leads to duplication and inefficiency.
- Not automating turret and wall production — during a biter attack, you need replacement defenses immediately, not handcrafted 30 seconds later.
- Using too few inserters per furnace or assembler — a single inserter cannot keep up with a red belt. Blue inserters or stack inserters are needed for high-throughput machines.
- Trying to clear large biter bases with personal weapons instead of using artillery — artillery has infinite range and clears nests with zero risk to your character.
Frequently Asked Questions
How long does it take to beat Factorio?
A first rocket launch takes 30-60 hours for most players. But launching a rocket is just the beginning — the Space Age expansion adds multiple planets to colonize, and megabase optimization can consume hundreds of hours. The average playtime on Steam is over 200 hours, and it's common to see 1000+ hour counts.
Is Factorio multiplayer?
Yes, Factorio has native multiplayer supporting dozens of concurrent players on a single map. Players share the same factory and can specialize in different production areas. Multiplayer adds a social engineering challenge on top of the logistics puzzle. Dedicated servers support persistent factories.
What did the Space Age expansion add?
Space Age (2024) added space platforms, 4 new planets with unique resources and mechanics, elevated rails, quality tiers for items, and new science types. Each planet has distinct challenges — Vulcanus has lava, Fulgora has lightning, Gleba has organic materials, and Aquilo has extreme cold. It roughly doubles the game's content.
What are the best mods for Factorio?
Quality-of-life mods: Squeak Through (walk between buildings), Even Distribution (evenly distribute items), FNEI (recipe browser). Overhaul mods: Krastorio 2 (expanded vanilla), Space Exploration (pre-Space Age space content), and Bobs+Angels (extreme complexity). The mod portal has 10,000+ mods.
What to Read Next
- Best Factorio Builds — Detailed breakdowns with gear, stats, and playstyle guides
- Factorio Tier List — Current meta rankings
- Factorio Walkthrough — Step-by-step progression from start to endgame
- Factorio Beginner's Guide — First session essentials
- Factorio Tips & Tricks — Advanced strategies and hidden mechanics
