Where Do Factorio Mods Go

This page tells you how to download and install mods, and gives a quick overview of what you should keep in mind when creating a mod. For more detailed instructions on creating mods, you may view the modding tutorial page. If you are looking for the modding API, check out the official Factorio Lua API documentation website. If you wish to know where to install a mod which is in a zipped format, please read the instructions on the application directory page.

  • 1Downloading & installing mods
    • 1.4Dependencies
  • 2Creating mods

We’re back, providing you with your weekly dose of Factorio content! In today’s issue 7, ChurchOrganist brings us up to speed on what has been happening with Yuoki’s mods lately, LoneWolf gives us the rundown of why decentralised smelting is clearly the way to go, and T-A-R informs us about. Open the mods folder and remove the mod that is not working correctly. 'diamond-5' is from DyTech mods. How do i know which mods are dytech ones? New to factorio Feel free to delete the whole folder if you don't care about the other mods. Factorio is a game that is coded in the language C, with an API provided by Wube (the developers of Factorio) to mod Factorio in the programming language Lua (version 5.2.1). This API allows adding scripts to the Factorio init process, to modify it without the source code of the base game being exposed, or modifying memory.

Downloading & installing mods

This page tells you how to download and install mods, and gives a quick overview of what you should keep in mind when creating a mod. For more detailed instructions on creating mods, you may view the modding tutorial page.If you are looking for the modding API, check out the official Factorio Lua API documentation website. If you wish to know where to install a mod which is in a zipped format. A mod with many features where you can make a Mobile Factory, build your base inside and travel around the world. The mod contains a way to transfer items remotely, some nice ways to mine Ore or extract Fluid, some new chemical elements, Data Storage of Items, and much more.

You can download the mods from the following places:

  • Mod portal (in-game)

Mod portal (in-game)

The 'Mods' section of the main menu is the best way to get mods. It combines downloading & installing, checking installed mods for updates, and enabling/disabling installed mods.

Mod portal (website)

The mod portal (website) is the center of mod hosting, where authors upload mods, and you can find previous versions, and discussions. Mods come as ZIP files, installed by copying (not unzipping) into the 'mods' directory in the user data directory. Verify a successful installation by viewing the 'Mods' list through the main menu, in-game.

Mod subforum

Mod authors maintain threads in the official mod subforum to support their work. There may be experimental mods or updates here that aren't available on the main portal. They will be downloaded as ZIP files, either as forum 'attachments', or with a link to a hosting site. These are installed the same way as mods downloaded from the portal.


Many mods use Factorio's base mod as their only dependency which you do not have to install separately. However, some mods may require you to install other mods for them to work and can also make suggestions for you to install other mods for them to extend their functionality.

Required dependency

When a mod you installed requires you to install another mod for it to work, the other mod, in this case, is a required dependency. The in-game mod portal automatically downloads required dependencies when downloading any mod.

Optional dependency

When a mod makes a suggestion to install another mod, but if it does not need that other mod for it to work, the other mod, in this case, is an optional dependency. You can install the optional dependencies which extend the functionality of a mod to enhance your gaming experience with the mod.


The dependencies can also be used to declare a mod to be incompatible with other mod versions, which prevents them from being loaded together.

Creating mods

See also: Modding tutorial

API documentation

  • Prototype documentation — What prototypes can be added to the game, and what are their properties
  • Documentation of the runtime API — Hook into events and change the world around the player.
  • Mod structure — The basic structure of all mods
  • Factorio data github repository — Tracks changes of the Lua prototype definitions in Factorio between releases.
  • Data.raw — Lists the names and types of all built-in prototypes

Lua scripting

You need to use the Lua programming language (version 5.2.1) to create any mods in Factorio. The game's mod system injects your code into the startup and to the data construction stage of the game. You can use any text editor to write the code for your mod. Well-known text editors that offer syntax highlighting for Lua are Notepad++ and Sublime Text.

Useful resources for Lua:

  • Lua REPL : A Lua read-eval-print-loop, essentially a sandbox.


Every mod requires a license since Factorio v0.11. If a mod has no license, it is assumed to have a Creative Commons license — Attribution-Noncommercial 4.0 International (CC BY-NC 4.0). However, it is possible to purposely make the mod unlicensed, to allow the code within it to be available to the public domain. The most popular distribution licenses for Factorio mods are the MIT license and the GPLv3 license.

Other useful legal links include:

See also

  • Category:Technical — Documentation of technical formats and API's not related to modding
Retrieved from 'https://wiki.factorio.com/index.php?title=Modding&oldid=181622'

Enemies (also commonly called biters) are creatures that want to harm the player. They are the native inhabitants of the extraterrestrial world in the form of arthropods living in organic nests, coexisting with each other peacefully. They are encountered in three species: Biters, spitters and worms. The species are further distinguished in four stages of growth, and thus strength. Enemies and nests show up on the map as red dots. Much like the player, enemies can slowly regain lost health.

  • 2Creatures
  • 3Nests
  • 5Evolution


Enemies are directly connected to the following achievements:

It stinks and they dont like it

Trigger an alien attack by pollution.


Destroy 10 spawners by impact.



Biters are one of two main antagonists in the game. They come in four sizes: small, medium, big and behemoth. In the beginning of a game, there will only be the small ones. With increasing pollution, they will become bigger, related to the enemy's evolution. As common sense may suggest, their method of attack is a straightforward charge to 'bite' things.

Small BiterWeakest of biters, can be easily killed with a pistol.
  • Health: 15
  • Damage: 7 Physical
  • Attack speed: 1.71/s
  • Speed: 43.2km/h
  • Range: 1
  • Pollution to join attack: 4
Medium BiterStronger and slightly faster than the small biter. Can pose a problem for and even kill weaker players.
  • Health: 75
  • Damage: 15 Physical
  • Attack speed: 1.71/s
  • Speed: 51.8km/h
  • Range: 1
  • Pollution to join attack: 20


  • Explosion: 0/10%
  • Physical: 4/10%
Big BiterDangerous, resistant to small arms. Can attack through walls, hitting objects directly behind them.
  • Health: 375
  • Damage: 30 Physical
  • Attack speed: 1.71/s
  • Speed: 49.7km/h
  • Range: 2
  • Pollution to join attack: 80


  • Explosion: 0/10%
  • Physical: 8/10%
Behemoth BiterExtremely durable and nearly immune to small arms, except for the strongest ordnance. Can attack through walls, hitting objects directly behind them.
  • Health: 3000
  • Damage: 90 Physical
  • Attack speed: 1.2/s
  • Speed: 64.8km/h
  • Range: 2
  • Pollution to join attack: 400


  • Explosion: 12/10%
  • Physical: 12/10%


Spitters are much like biters and only appear slightly later on in the game as the evolution factor increases. Their main difference from biters is their ranged attack. Using predictive aiming, they spit a stream of acid at enemies which leaves behind a puddle of acid where it hits the ground. Due to the spitters' predictive aiming, the acid stream can be dodged by suddenly changing walking directions or standing still.[1] Both the stream and the puddle of acid deal damage of time and slow down players and vehicles. Most entities of the game have a much lower resistance to acid than other damage types (including turrets and armor), so spitters are effectively more potent against the player and his factories. Their behaviour and size classification are the same as with biters, but their health is universally lower and they are resistant exclusively against explosives, with no physical resistance.

Small SpitterWeakest of spitters. Easy to kill with any weapon, but attacks at range.
  • Health: 10
  • Range: 13
  • Pollution to join attack: 4
  • Speed: 40.0km/h

Acid projectile:

  • Attack speed: 0.6/s
  • Area of effect size: 1
  • Damage (on contact): 12 Acid

Acid puddle:

  • Lifetime: 32 seconds
  • Damage: 7.2 Acid/second
  • Applies effect (on contact):
    • Movement/vehicle speed modifier: 60%
    • Duration: 2 seconds
Medium SpitterStronger and slower than the smaller version. Can pose a problem for and even kill weaker players.
  • Health: 50
  • Range: 14
  • Pollution to join attack: 12
  • Speed: 35.6km/h

Acid projectile:

  • Attack speed: 0.6/s
  • Area of effect size: 1.25
  • Damage (on contact): 24 Acid

Acid puddle:

  • Lifetime: 32 seconds
  • Damage: 28.8 Acid/second
  • Applies effect (on contact):
    • Movement/vehicle speed modifier: 50%
    • Duration: 2 seconds


  • Explosion: 0/10%
Big SpitterAn even bulkier spitter and so can take more damage.
  • Health: 200
  • Range: 15
  • Pollution to join attack: 30
  • Speed: 32.4km/h

Acid projectile:

  • Attack speed: 0.6/s
  • Area of effect size: 1.35
  • Damage (on contact): 36 Acid

Acid puddle:

  • Lifetime: 32 seconds
  • Damage: 130 Acid/second
  • Applies effect (on contact):
    • Movement/vehicle speed modifier: 40%
    • Duration: 2 seconds


  • Explosion: 0/15%
Behemoth SpitterThe bulkiest of the spitters and so can take even more damage.
  • Health: 1500
  • Range: 16
  • Pollution to join attack: 200
  • Speed: 32.4km/h

Acid projectile:

  • Attack speed: 0.6/s
  • Area of effect size: 1.75
  • Damage (on contact): 60 Acid

Acid puddle:

  • Lifetime: 32 seconds
  • Damage: 360 Acid/second
  • Applies effect (on contact):
    • Movement/vehicle speed modifier: 30%
    • Duration: 2 seconds


  • Explosion: 0/30%


The Worms are natural allies of biters and spitters and will attack the player if they get close enough with an attack similar to spitters'. They act like static turrets and will not follow attackers. They rely on high damage, great range and splash damage to keep the player away from the worms and the nests they protect, but either one of these advantages can be overcome. Unlike other enemies, they are also highly resistant to fire. They will spit acid at the player, which can also leave acidic puddles on the ground that can still damage players and vehicles, as well as slow them both down and leave a brief acidic, damaging effect for a few seconds. However, placed buildings and tiles are unaffected by the acid puddles, but still take damage normally by the acid projectile.

Worms come in 4 sizes, their power increasing with size. Like biters and spitters, behemoth, big and medium worms spawning is influenced by the evolution factor. Worms are only created during enemy expansion when a certain evolution factor requirement is fulfilled. This is 0.3 for the medium worm, 0.5 for the big worm and 0.9 for the behemoth worm. Below these evolution factors, worms can only be created by the map generation. In map generation, the game restricts higher tier worms behind the distance from the starting point. The further away the player goes from the starting area, the stronger the worms become.

Small WormA weak worm. It is still capable of killing the player unless it is targeted as priority.
  • Health: 200
  • Range: 25

Acid projectile:

  • Attack speed: 0.66/s
  • Area of effect size: 1.4
  • Damage (on contact): 36 Acid

Acid puddle:

  • Lifetime: 32 seconds
  • Damage: 21.6 Acid/second
  • Applies effect (on contact):
    • Duration: 2 seconds
    • Movement/vehicle speed modifier: 60%
Medium WormMedium worms are dangerous to even more advanced players. They should be handled with care.
  • Health: 400
  • Range: 30

Acid projectile:

  • Attack speed: 0.66/s
  • Area of effect size: 1.55
  • Damage (on contact): 48 Acid

Acid puddle:

  • Lifetime: 32 seconds
  • Damage: 57.6 Acid/second
  • Applies effect (on contact):
    • Duration: 2 seconds
    • Movement/vehicle speed modifier: 50%


  • Explosion: 5/15%
  • Fire: 2/50%
  • Physical: 5/0%
Big WormBig worms are not as much more dangerous as resilient. They are almost immune to common gunfire of any sort.
  • Health: 750
  • Range: 38

Acid projectile:

  • Attack speed: 0.66/s
  • Area of effect size: 1.75
  • Damage (on contact): 72 Acid

Acid puddle:

  • Lifetime: 32 seconds
  • Damage: 259 Acid/second
  • Applies effect (on contact):
    • Duration: 2 seconds
    • Movement/vehicle speed modifier: 40%


  • Explosion: 10/30%
  • Fire: 3/70%
  • Physical: 10/0%
Behemoth WormBehemoth worms are the most dangerous of worms. They are just as resilient as Big worms, with much greater range.
  • Health: 750
  • Range: 48

Acid projectile:

  • Attack speed: 0.66/s
  • Area of effect size: 2
  • Damage (on contact): 96 Acid

Acid puddle:

  • Lifetime: 32 seconds
  • Damage: 691 Acid/second
  • Applies effect (on contact):
    • Duration: 2 seconds
    • Movement/vehicle speed modifier: 30%


  • Acid: 0/100%
  • Explosion: 10/30%
  • Fire: 3/70%
  • Physical: 10/0%
A worm's attack animation.


The spawn points of biters and spitters. While nests themselves are generally defenseless, the enemies they release over time effectively serve as a form of guards to distract the player and any nearby turrets, and are often accompanied by worms. Nests exposed to pollution will use it to send enemies to join attacks. Enemies not engaged in combat may seek out the nearest nest for protection.

The nests are highly resistant to fire and otherwise generally more resilient than a medium worm.

Biter's nest
  • Health: 350


  • Explosion: 5/15%
  • Fire: 3/60%
  • Physical: 2/15%
Spitter's nest
  • Health: 350


  • Explosion: 5/15%
  • Fire: 3/60%
  • Physical: 2/15%


Every 4-60 minutes, a group of 5-20 biters/spitters will leave their base to create a new base which will consist of as many worms/nests as there are members in the group. This group will search for a suitable spot that's 3-7 chunks away from existing bases. The interval between enemy expansions is global, and the higher enemy evolution, the shorter the interval is on average. Furthermore, with higher evolution, the groups are bigger on average.

Once they have found a suitable spot, each biter/spitter in the group dies and forms a new nest or worm. There is a delay between each member sacrificing itself for to create a worm/nest, so creating the new base from the expansion group can take quite a long time, depending on the group size. Medium worms are only formed if the current evolution is higher than 0.3, big worms only if the current evolution is higher than 0.5 and behemoth worms are only formed if current evolution is higher than 0.9. The game randomly chooses whether to form a new biter nest, spitter nest, small worm, or bigger worm if the evolution factor is high enough. [2]


'Kills' tab on the production statistics screen.

Nests spawn biters and spitters freely. However, biters and spitters will only aggressively engage the player's factory if the pollution cloud of the factory reaches a nest because pollution is consumed to send biters or spitters to join the next attack. Every 1 to 10 minutes (random) the mustered biters launch an attack. If not all biters have arrived at the rendezvous point by that time, they will wait up to an additional 2 minutes for stragglers. The attack then proceeds to their target over the shortest path possible, accounting for terrain, but not for player entities that could pose an obstacle (like walls).

If there is a clear path somewhere around those obstacles, the biters will attempt to go around. If there is no clear passage or a clear passage would mean deviating too far from the original course, the biters will attack whatever is in their way to go through. This can be exploited to an extent; creating mazes at regular intervals along a barrier can direct the biters through a gauntlet not dissimilar to tower defense.

However, if a biter comes in proximity of a military unit or structure, it will prioritize these and attempt to immediately attack them instead, again trying to reach the new target over the shortest possible path with no too great detours, if possible.


Spawn chances of biters from biter spawners by evolution factor.
Spawn chances of spitters from spitter spawners by evolution factor.
Weight graph of both spawners by evolution factor. The values shown are primarily for indicating when certain types start and stop spawning, for actual chances refer to the tables or other charts.

The evolution factor is a global variable that determines what kind of biters will be spawned. You can check the variable in the dev console via the following command (does not disable achievements):

The evolution factor goes from 0 (not evolved at all) to 1 (maximal evolution). At the moment the evolution factor can only increase.

Besides choosing what kind of biter will be spawned, the evolution factor also influences the spawning interval. This interval (spawning_cooldown in the enemy-spawner definition) is interpolated between 360 (0 evolution) and 150 (1 evolution) game ticks (= 6 to 2.5 seconds).

Methods of increasing

The evolution factor is increased by three kinds of events:

  • The passage of time very slightly increases the evolution factor.
  • The global pollution production increases the evolution factor.
  • Destroying nests significantly increases the evolution factor.

All these values are set in game.map_settings.enemy_evolution. From there they can be changed or modded.

The default settings are:

Source perVariable in enemy_evolutionPercent increase
1 Pollution unitpollution_factor0.00009%
Destroyed enemy spawnerdestroy_factor0.2%

Pollution production is the total pollution produced by buildings per tick, not the pollution spreading on the map, so it is not reduced by trees or other absorbers.e.g. : 10 boilers produce 300 pollution in one minute, raising the evolution factor by around 0.027%.

The percentages are applied on the base of (1 - current_evolution_factor)². So for instance destroying enemy spawners in the beginning of the game results in increase of evolution factor by 0.002 (0.2%) while doing this when the evolution factor is 0.5 the increase is only 0.0005 (0.05%).

This also means that the evolution factor approaches 1 asymptotically - generally, increases past 0.9 or so are very slow and the number never actually reaches 1.0.

Spawn chances by evolution factor

The probability charts show the chances of each type of biter/spitter for each spawner at all evolution levels.

Advanced: Evolution factor components and computation

This section has charts plotting the individual evolution factor components and discusses possibilities for manually estimating the evolution factor.

1. Single-component evolution factor increase with time
2. Single-component evolution factor increase with pollution
3. Single-component evolution factor increase with destroyed spawners


  • Data from version 0.16.51.
  • This does not take into account that the evolution factor is factored with (1 - evolution)^2 and not (1 - evolution)
  • All charts end at approximately an evolution factor of 0.99.
  • To simplify calculation, the time and pollution charts are calculated using steps of 1,000 seconds / 1,000,000 pollution units - in both cases 1,000 times larger than the unit the game uses for the calculation. Because of the recursive nature of the calculation, this makes the values in the charts somewhat higher than those the game would obtain in the same calculation; however, the difference is fairly minimal (less than 1 percentage point). The spawners chart is calculated 1-to-1 and therefore accurate.
  • While time passed is shown on save files and spawners destroyed can be retrieved from player statistics, the game does not currently report the total pollution released by the player. Also, none of the well-known Factorio calculators show pollution generated by a particular factory. Therefore, to make use of the pollution chart the player's pollution output would need to be manually estimated.
  • Given that the game reports the actual evolution factor (console: /evolution) whenever the player wishes, these charts are intended primarily to help estimate the impact of planned base expansions and similar activities on the evolution factor's future development.


These charts (click to enlarge) represent the situation where each evolution factor component (time, pollution, destroyed spawners) is the only component contributing to the evolution factor in that entire game. They are therefore not realistic, as in a typical game all three components will contribute, some at varying times and intensities.

Because of how contributions to the evolution factor (hereinafter, EF) are calculated (multiplied by (1 - current EF)), it is not possible to simply add the values indicated by these charts for a game's time passed, pollution generated, and / or spawners destroyed so far to retrieve the total evolution factor.

For example, if 20 hours have passed (single-component EF =~ 0.25), 10 million pollution units were released (single-component EF =~ 0.15), and 200 spawners were destroyed (single-component EF =~ 0.35), the actual evolution factor will not be (0.25 + 0.15 + 0.35 =) ~0.85.

However, the evolution factor will always be less than the sum of all individual components as indicated by these charts, and at least as high as the highest individual component. Thus, using the values from above, the EF will be at least 0.35 and less than 0.85. A smarter approach is required to compute the amount of pollution released.

Computation of actual evolution factor

The actual EF can be computed as follow :

1 - EF = (1 - E[t]) * (1 - E[p]) * (1 - E[s]), where E[t], E[p], and E[s] are the single-component values from the pollution, time, and spawner charts, in that order.

A key observation in understanding where this formula comes from is that each incremental change of the evolution factor is effectively a multiplication of 1 - EF by a constant (depending on the nature of the change). For example, another way of saying that killing a biter nest augments evolution by 0.2% of 1 - EF, is to say that killing a biter nest multiplies 1 - EF by 0.998.

So, like multiplication, evolution is, barring rounding errors, associative and commutative. The commutativity means that the order in which you take evolution-increasing actions does not matter, and along with the associativity results in the formula above.

That knowledge can also be applied to compute the above charts exactly, or to compute a component of evolution without having to refer to the chart at all. For example, pollution as a function of time only is 1 - 0.999996 ^ t where t is the time in seconds.

For the values from above, we can deduce the evolution factor 1 - EF = (1 - 0.25) * (1 - 0.15) * (1 - 0.35) = 0.75 * 0.85 * 0.35 = 0.41, which gives an evolution factor of 0.59.

This formula can also be used to estimate impact of future player activities on the EF: a set of actions that is known to bring the evolution factor of a world from 0 to EF(2) (eg using the above chart and formula) will bring it from EF(1) to 1 - (1-EF(1)) * (1-EF(2))

For example, if the player planned to spend the next 20 hours building up their base, releasing 10 million pollution and destroying 200 spawners in the meantime (i.e., the same numbers as in the example above), and the EF at the start of this period were, say, 0.55, then the estimated EF at its end will be 1 - (1 - 0.55) * (1 - 0.59) = 0.81.


  • The player near some enemy nests and worms.

  • The player among acid puddles created by attacking worms.

    Mac launcher for windows download. Zoom is the leader in modern enterprise video communications, with an easy, reliable cloud platform for video and audio conferencing, chat, and webinars across mobile, desktop, and room systems. Zoom Rooms is the original software-based conference room solution used around the world in board, conference, huddle, and training rooms, as well as executive offices and classrooms. Founded in 2011. Jun 18, 2020 This free application is compatible with Mac OS X 10.6 or later. Our built-in antivirus checked this Mac download and rated it as virus free. The bundle id for this app is us.zoom.xos. The most popular versions among the program users are 3.0, 2.5 and 0.9. This free software for Mac OS X was originally designed by Zoom Video Communications, Inc. Note: For Mac High Sierra (10.13.x), you will need to click on Allow too. Click the lock icon again to prevent any further changes. Installing the Zoom application. Visit our Download Center. Under Zoom Client for Meetings, click Download. Double click the downloaded file. It is typically saved to your Downloads folder.

  • Both the player and some buildings getting attacked by biters.

  • Enemy nests seen in a map generation preview (deathworld setting).

  • Line of gun turrets defending against biters.


  • 0.17.0:
    • Behemoth worm added.

Where Are Factorio Mods Saved

  • 0.15.0:
    • Increased the damage, range, and health of worms.
    • Decreased health and resist of Behemoth biters.

Where Do Factoria Mods Google Chrome

  • 0.13.10:
    • Biters and other units won't become aggressive as a result of friendly-fire.
  • 0.13.0:
    • Big and behemoth enemies now spawn 50% slower.
    • Changed the way evolution factor approaches the maximum (1).
      • The addition of evolution factor was changed from addition * (1 - evolution) to addition * (1 - evolution)^2
      • This means that the progress gets more slower towards the high values.
  • 0.12.26:
    • Running biters over with a vehicle will now anger them in peaceful mode.
  • 0.12.0:
    • Updated sounds for enemies.
  • 0.11.17:
    • Items dropped by enemies(*) are now collected automatically and from longer distances.
  • 0.11.6:
    • Range of spitters is now 15, less than turrets.
  • 0.11.0:
    • Spitters added.
    • Drawing of enemies optimised, so adding new colors does not impact VRAM.
    • Blood splashes on death are now procedural.
  • 0.9.0:
    • Turrets no longer search for enemies when none are near.
    • Biters can no longer destroy the shipwreck in the 3rd new hope campaign.
  • 0.8.1:
    • Further improvement to enemy AI.
  • 0.8.0:
    • Decreased the range of medium worm from 25 to 20.
  • 0.7.2:
    • Biter AI improved.
  • 0.7.1:
    • Peaceful mode added for freeplay.
  • 0.7.0:
    • Enemy creepers were replaced by small, medium and big biters.
    • Enemy turrets were replaced by small, medium and big shooting worms.
    • Enemies move and attack in groups.
    • Enemies wander around their base when they have nothing to do.
    • Enemies call for help when attacked.
    • Enemies can create new bases.
    • Enemies can now destroy all player creations they find.

Where Are Factorio Saves Located

  • 0.1.0:
    • Introduced, called 'creepers'

Factorio Mods Location

See also

Factorio Mod Pack

Retrieved from 'https://wiki.factorio.com/index.php?title=Enemies&oldid=183511'