About Inverted Quality
From Factorio Mod PortalInverts the Quality system to negative tiers (positive tiers are removed). Crafting items has a two-thirds chance to reduce their quality by one tier. Items in the lowest tier are nonfunctional. The new Downgrade Port allows high-quality items to be used in low-quality recipes, and the Meltdown Facility allows the melting down of low-quality items back into Normal base materials. Map sliders for higher resources are recommended.
Inverted Quality
This mod let you see how Factorio can work if the Quality system is inverted.
- Quality has only negative tiers, positive tiers are removed.
- Crafting items has a 2/3 chance to degrade the quality by one tier.
- Unlike vanilla quality, long production chains tend make items worse.
- Quality modules reduce the degradation chance in crafting.
- Note that quality modules are now unaffected by quality themselves due to an engine limitation.
- Enemies spawn with degraded quality, offsetting the extra pollution inevitably produced in this mod.
- Two new entities, the Downgrade Port and the Meltdown Facility, help with gameplay.
Quality tiers
This mod used to have five quality tiers. The gameplay turned out to be problematic, thus it now has 4.
| Quality | Level | Additional notes | |-----------------|-------|-------| | Normal | 0 | | | Shoddy | -1 | | | Defective | -3 | | | Broken | -3 | Items are nonfunctional |
Getting started
This mod is generally incompatible with existing saves. For new saves, it is recommended to increase the resource map sliders and optionally to decrease the map sliders for pollution and enemies.
Space Age is optional.
New entities
Downgrade port
A 1x1 entity that can be attached to the side of assemblers. Items inserted into the port are delivered to the assembler reduced in quality by one level.
Downgrade ports mean that quality in this mod is backwards-compatible: high-quality items can be used in low-quality recipes.
Meltdown facility
Items of any quality can be melted down into 1/8 of their base materials.
These materials come out of the Meltdown facility in Normal quality.
Base materials are defined as those obtained by repeated recycling. However, note that unlike chained recyclers which give a factor 1/4 at each step, meltdown performs _all the steps at once_ with an _overall_ factor of 1/8.
Further information
- Technically, this mod works by making higher ‘quality’ items worse combined with performing a large number of prototype transformations in order to make the best quality tier equivalent to Normal.
- There are likely to be some mistakes due to e.g. missing documentation on the Factorio wiki. This can cause entities to be much too powerful (if the undo operation was missed) or too weak (if it was applied incorrectly). Please report these cases in Discussion if you notice them.
- Like in vanilla, each instance of degradation has a 10% chance to be 'upgraded' to jump extra tiers. This applies to both machine crafting and handcrafting.
- Multi-step handcrafting results in extra-degraded final products (and no junk byproducts).
- A few base game issues affect this mod.
- Science pack durability stats are misrepresented in the UI.
- Mining drill resource drain, science pack drain rate and beacon power usage are immune to quality due to API limitations.
Special Thanks
- SafTheLamb for discussions on the names of the quality tiers.
- Hurricane for their Arc Furnace graphics used for the Meltdown Facility.
- AnotherZach, protocol_1903 and Osmo for feedback and improvements.
Highlights
From source dataGame versions
Built for Factorio 2.0.
Footprint
Rated a light load on a server.
License
Published under GPL-3.0.
Inverted Quality on Nxeon
From our catalogue- One-click install
- Supported on Nxeon Factorio servers. We download it from Factorio Mod Portal, place it, and restart the server.
- Server side
- Required on the server
- Server load
- light
- Smallest plan we suggest
- Factorio — 2 GB (2 GB RAM). This follows our own load rating above, not a benchmark.
- Latest build
- 1.5.2, released 2026-05-29
Recent builds
| Build | Released | Game versions | Loaders |
|---|---|---|---|
| 1.5.2 | 2026-05-29 | 2.0 | n/a |
| 1.5.0 | 2025-08-26 | 2.0 | n/a |
| 1.4.4 | 2025-07-31 | 2.0 | n/a |
| 1.4.3 | 2025-06-16 | 2.0 | n/a |
| 1.4.2 | 2025-06-06 | 2.0 | n/a |
| 1.4.1 | 2025-05-30 | 2.0 | n/a |
Dependencies
- Required: quality (factorio_portal, not in our catalogue)
- Required: PlanetsLib
- Required: Quality Cursor
- Optional: [reserved]
Declared by the newest build that lists any. Required ones are installed with it on one-click installs.
Run Inverted Quality on a Factorio server
Pick a server or deploy a new one above; it is installed in one click.
What kind of mod it is
From the catalogMaps & scenarios
Custom maps, arenas and scenarios to play on.
Runs on your server
From source side supportFactorio Mod Portal lists Inverted Quality as required on the server. Check its Factorio Mod Portal page to see whether players need it too.
Compatibility
- Game
- Factorio
- Runs on
- Serverrequired on the server
- Game versions
- 2.0
Verified at the source
- ✓Factorio Mod PortalOfficial listing, checked 2026-10-08Open ↗
- ✓Authorthesixthroc, as published on Factorio Mod Portal
- ✓LicenseGPL-3.0Free

