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.
Picking the right build determines how your experience plays out. These builds are ranked by overall effectiveness — factoring in damage, survivability, gear requirements, and how well they scale into endgame.
Quick Rankings
| Build | Tier | Playstyle | Core Gear |
|---|---|---|---|
| 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. | Yellow/Red belts, splitters, underground belts, assembling machines |
| 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. | Trains, rail signals, chain signals, train stops, logistic robots |
| Spaghetti | B | Build whatever you need wherever there's space. When something stops working, add more belts until it does. Embrace the chaos. | Whatever works — belts, inserters, assemblers placed wherever they fit |
| 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. | Electric locomotives, cargo wagons, fluid wagons, train stops, rail signals |
| 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. | Flamethrower turrets, thick walls, artillery, efficiency modules (pollution reduction) |
S-Tier: Main Bus
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.
Core Setup
| Slot | Choice | Why |
|---|---|---|
| Primary Equipment | Rocket Launcher | The personal rocket launcher fires explosive rockets in an arc, dealing heavy AoE damage. |
| Core Gear | Yellow/Red belts, splitters, underground belts, assembling machines | Maximizes build potential |
| Stat Priority | Belt throughput, bus width (4 belts per resource), assembler ratios | Optimal scaling |
| Key Mechanic | 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). |
How to Play Main Bus
Build a straight highway of core resources, branch off production lines at 90 degrees, and expand the bus when you need more throughput.
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.
What makes this build work: The synergy between Rocket Launcher and belt logistics creates a gameplay loop that outperforms other options. Core gear like Yellow/Red belts, splitters, underground belts, assembling machines amplifies this further.
Pros:
- Highest overall performance
- Clear stat priority (Belt throughput, bus width (4 belts per resource), assembler ratios) makes gearing straightforward
- Works in all content types
Cons:
- Popular pick, resources may be contested
- Needs specific gear to reach full potential
S-Tier: City Block
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.
Core Setup
| Slot | Choice | Why |
|---|---|---|
| Primary Equipment | Flamethrower Turret | The most efficient static defense in the game. |
| Core Gear | Trains, rail signals, chain signals, train stops, logistic robots | Maximizes build potential |
| Stat Priority | Train throughput, block size standardization, intersection design | Optimal scaling |
| Key Mechanic | circuit networks | Red and green circuit wires connect machines, allowing conditional logic. |
How to Play City Block
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.
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.
What makes this build work: The synergy between Flamethrower Turret and circuit networks creates a gameplay loop that offers reliable performance. Core gear like Trains, rail signals, chain signals, train stops, logistic robots amplifies this further.
Pros:
- Most versatile option
- Clear stat priority (Train throughput, block size standardization, intersection design) makes gearing straightforward
- Works in all content types
Cons:
- Lower peak damage than S-tier
- Needs specific gear to reach full potential
B-Tier: Spaghetti
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.
Core Setup
| Slot | Choice | Why |
|---|---|---|
| Primary Equipment | Laser Turret | Laser turrets draw power from your electricity grid and fire automatically at enemies. |
| Core Gear | Whatever works — belts, inserters, assemblers placed wherever they fit | Maximizes build potential |
| Stat Priority | Does it work? Then it's fine. | Optimal scaling |
| Key Mechanic | train systems | Trains transport bulk materials over long distances faster than belts. |
How to Play Spaghetti
Build whatever you need wherever there's space. When something stops working, add more belts until it does. Embrace the chaos.
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.
What makes this build work: The synergy between Laser Turret and train systems creates a gameplay loop that offers reliable performance. Core gear like Whatever works — belts, inserters, assemblers placed wherever they fit amplifies this further.
Pros:
- Best survivability
- Clear stat priority (Does it work? Then it's fine.) makes gearing straightforward
- Works in all content types
Cons:
- Slower clear speeds
- Needs specific gear to reach full potential
A-Tier: Train World
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.
Core Setup
| Slot | Choice | Why |
|---|---|---|
| Primary Equipment | Artillery | Artillery turrets and wagons fire massive shells at extreme range (up to 7 chunks), automatically targeting biter nests. |
| Core Gear | Electric locomotives, cargo wagons, fluid wagons, train stops, rail signals | Maximizes build potential |
| Stat Priority | Train scheduling, signal placement, stacker designs for loading/unloading | Optimal scaling |
| Key Mechanic | nuclear power | Nuclear reactors use Uranium-235 fuel cells to generate massive power (160MW per reactor pair with neighbor bonus). |
How to Play Train World
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 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.
What makes this build work: The synergy between Artillery and nuclear power creates a gameplay loop that provides a unique approach. Core gear like Electric locomotives, cargo wagons, fluid wagons, train stops, rail signals amplifies this further.
Pros:
- Strong in group/team content
- Clear stat priority (Train scheduling, signal placement, stacker designs for loading/unloading) makes gearing straightforward
- Excels in its niche
Cons:
- Weaker solo performance
- Requires deep game knowledge
A-Tier: Death World
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.
Core Setup
| Slot | Choice | Why |
|---|---|---|
| Primary Equipment | Atomic Bomb | The ultimate weapon — a nuclear warhead fired from the Spidertron or rocket launcher that annihilates everything in a massive radius. |
| Core Gear | Flamethrower turrets, thick walls, artillery, efficiency modules (pollution reduction) | Maximizes build potential |
| Stat Priority | Military tech priority, pollution management, wall coverage | Optimal scaling |
| Key Mechanic | biome defense | Biters (alien bugs) attack your factory based on pollution level. |
How to Play Death World
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.
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.
What makes this build work: The synergy between Atomic Bomb and biome defense creates a gameplay loop that provides a unique approach. Core gear like Flamethrower turrets, thick walls, artillery, efficiency modules (pollution reduction) amplifies this further.
Pros:
- Unique, rewarding playstyle
- Clear stat priority (Military tech priority, pollution management, wall coverage) makes gearing straightforward
- Excels in its niche
Cons:
- High skill floor, punishing when misplayed
- Requires deep game knowledge
Build Progression Path
- Start with City Block — the most forgiving option for learning the game
- Transition to Main Bus once you understand core mechanics and have access to Rocket Launcher
- Keep a Spaghetti setup for content that keeps killing you
- Try Death World for a fresh experience once you've mastered the basics
Gearing Tips
- Invest in your primary equipment first — it gives the biggest power spike
- 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.
- Don't spread upgrade resources across multiple builds until endgame
See our tier list for current meta rankings, or the beginner's guide if you're just getting started.
