Guide / Mods

Modding Moon Sweepers Without Breaking Your Save

Moon Sweepers has a working modding scene, arranged around BepInEx and a standalone loader. Here are the files, the install order, and the two places it usually goes wrong.

Engine: Unity 6000.6
Gate: IL2CPP metadata 108
Checked: 27 Oct 2026

Quick answer

Stock BepInEx cannot load plugins in Moon Sweepers. The game ships IL2CPP metadata version 108, and the Cpp2IL bundled with BepInEx stops at 106, so it fails with Unsupported metadata version found! We support 23-106, got 108 and no plugin is ever loaded. You need a patcher, and there are currently two separate loader ecosystems that are not interchangeable.

Decide which one a mod needs before you install anything. A mod from the wrong ecosystem looks exactly like a broken mod.

The metadata 108 problem

Moon Sweepers is a Unity 6000.6 game compiled with IL2CPP. To inject plugins, BepInEx has to generate interop assemblies by reading the game's metadata file — and the version of Cpp2IL bundled with BepInEx only understands metadata up to 106.

The community fix is a preloader patcher that runs before plugins load and does three things:

Generates interop assemblies by reading types, fields and methods from the live IL2CPP runtime instead of parsing global-metadata.dat, then feeds them to Il2CppInterop's generator the way Cpp2IL would have. Roughly one second to dump, ten seconds to generate, and it re-runs automatically when the game updates.
Fixes Il2CppInterop's view of Unity 6000.6 classes — the internal Il2CppClass layout changed in this Unity version, which otherwise breaks class injection with Base class Il2CppSystem.Object is value type.
Repairs broken method references in the generated assemblies, such as ReadOnlySpan.GetPinnableReference, which otherwise throw MissingMethodException in some Unity APIs.

ConfirmedThe Cpp2IL error is expected, not a failure

After installing the patcher, BepInEx\LogOutput.log will still show BepInEx's own Cpp2IL complaint about metadata version 108. The patcher takes over right after it. A successful start ends with Chainloader startup complete — that line is your proof, not the absence of the error.

Two loader routes that do not mix

This is the part that costs people an evening. There are two independent ways to run mods, and individual mods are built for one or the other.

The two Moon Sweepers loader routes compared
	BepInEx route	Standalone loader route
What it is	BepInEx 6.0.0-be.791 (Unity.IL2CPP win-x64) plus a metadata patcher	A single one-click mod loader packaged by its author
Where plugins go	BepInEx\plugins	The loader's own Mods folder
Setup effort	Manual: download BepInEx, extract, add patcher, first launch 15 s slower	Install and undo in one click, no internet needed
Mods that use it	Landmark Radar, Work Area Lines, Belt Overdrive, Machine Overclock, Vehicle Camera Fix, Moon Teleport, Sell x3	Team Upgrades and the author's other plugins
Main risk	Easy to get the folder layout wrong and see nothing load	A mod built for BepInEx will not appear if you install it here

The practical rule: read the mod's own Requirements section and follow that route. Do not assume one loader covers everything, and do not install both into the same game folder without a backup.

NoteSave editors are a third category

The money editor does not use either loader. It edits your save file directly, outside the game process, which is why it survives game updates and works with the current Steam build.

What mods exist

Eleven files are currently published, and they fall into four groups: the two loaders, the metadata patcher, gameplay plugins, and one save editor.

Moon Sweepers mods available on Nexus Mods
Mod	What it does	Route
Moon Sweepers BepInEx Patcher	The metadata 108 fix described above. Required before any BepInEx plugin will load. Does not change the game itself.	BepInEx base
MOON SWEEPERS MOD LOADER	One-click loader, no internet connection required, easy to undo. Required by Team Upgrades and the author's other plugins.	Standalone
Team Upgrades	Makes tool purchases, container upgrades, upgrade-tree unlocks and inventory tiers apply to the whole crew instead of only the buyer.	Standalone
Landmark Radar	Radar for flags, landing sites and stations, with surface distances and optional beams. Plugin only — it ships no loader.	BepInEx
Work Area Lines	Draws the vehicle's real cleaning width on the ground, including upgrades and current suction level. Toggle with F8.	BepInEx
Belt Overdrive	Adds a four-level Logistics upgrade: +25/50/100/150% belt speed, up to 2.75 m/s. Cargo and belt walking follow the new speed.	BepInEx
Machine Overclock	Four-level Economy upgrade for the Pressure Chamber and Stone Press. At max, sand takes 4.8 s instead of 12 s and stone 2.4 s instead of 6 s.	BepInEx
Vehicle Camera Fix	Stops the camera auto-recentring while driving, widens the pitch range and makes it follow slopes. F10 returns to the stock camera.	BepInEx
Moon Teleport	Teleport to base, garages, stations, map markers and your own named points, on foot or with the vehicle you are driving. English and German.	BepInEx
Sell x3	Multiplies income by three. Small, single-purpose plugin.	BepInEx
More Money - Save Editor	Adds money to the crew wallet by editing the save file rather than the game. Automatic backup and one-click restore.	Save editor

Moon Sweepers astronaut among processing machines and solar panels, the systems that Belt Overdrive and Machine Overclock mods affect — The most popular mods right now are quality-of-life and throughput tweaks. Belt Overdrive and Machine Overclock both target the production chain shown here.Official Steam screenshot, copyright DragDrop Games. Used for identification and commentary.

Installing a mod

The BepInEx route, in order. Skipping a step usually produces a game that launches normally and simply ignores your plugins.

Download BepInEx 6.0.0-be.791, Unity.IL2CPP win-x64, from the official BepInEx bleeding-edge builds page.
Extract it into the game's root folder, next to the game executable.
Extract the patcher so the DLL ends up at BepInEx\patchers\MoonSweepers.ModEngine\MoonSweepers.ModEngine.dll.
Launch the game once. The first start takes about 15 seconds longer while interop assemblies are generated.
Confirm BepInEx\LogOutput.log ends with Chainloader startup complete.
Only now drop plugin DLLs into BepInEx\plugins.

For the standalone loader route, extract its archive into the game folder and run its installer. Mods then go into that loader's own Mods folder, which is a different location from BepInEx\plugins.

TipConfiguration lives in plain text files

BepInEx plugins create a .cfg file under BepInEx\config on first launch. Work Area Lines, for example, exposes its toggle key, line length, width and colours there. Editing the config is safer than reinstalling the mod.

Mods in co-op

The rule depends on what the mod actually touches.

Client-side cosmetic mods are safe to differ. Work Area Lines only draws lines on your own screen for the vehicle you are driving. Your crewmates see nothing, and nothing breaks.
Gameplay mods need to agree with the host. Moon Teleport is labelled co-op untested by its author, which is an honest warning rather than a guarantee.
The upgrade economy is host-authoritative. Since patch 1.0.3 the whole crew uses the host's upgrade matrix, so a mod that changes upgrade behaviour only produces the same result for everyone if the host runs it.

Watch outVersion mismatch is the usual culprit

Patch 1.0.3 notes state that all crewmates must be on the same game version. Mods add a second dimension: same game version, different mods, or different mod versions. If a session misbehaves only for some players, strip mods to a common set before debugging anything else.

Saves, updates and uninstalling

Do three things before your first mod, in this order.

Update the game to 1.0.4 or later so automatic backups are active. Five backups per slot, taken a minute into each session and then every 30 minutes, stored in AppData\LocalLow\DragDropGames\MoonSweepers\Backups.
Copy that Backups folder somewhere outside AppData. A cloud sync problem or a bad uninstall should not be able to take your world with it.
Test in a separate save slot. Never your main world, and never a world other people are playing in.

Several mod authors state that removing their mod is save-safe, and the ones that add upgrades to the tree are designed that way deliberately. Check the individual mod page before removing one from a save you care about.

Watch outSaves do not go backwards

A save created on 1.0.4 cannot be opened in an older version of the game. This is unchanged by mods, and it means rolling back the game to match an old mod build can cost you the save if you have none of the manual copies above.

Where to download

Moon Sweepers mods are published on Nexus Mods, which handles hosting, virus scanning, version history and update notifications:

Moon Sweepers on Nexus Mods

BepInEx itself comes from the official bleeding-edge builds page, not from Nexus. Take BepInEx 6.0.0-be.791, Unity.IL2CPP win-x64 — the exact build the patcher is written against.

If you want a faster economy without any of this, the automation guide covers the in-game version and the money guide covers the multipliers you already have.