Modding has revitalized cooperative gaming, turning indie titles like Lethal Company, Risk of Rain 2, Valheim, and Content Warning into endless sandboxes of emergent gameplay. The Thunderstore Mod Manager (and its open-source companion r2modman) is the preeminent distribution platform for Unity and BepInEx-based modifications. However, both new modders and veteran players frequently encounter two fundamental questions: Is Thunderstore safe to install? and does everyone need thunderstore mods for a moid to work?
Multiplayer Modding: Does Everyone Need Thunderstore Mods for a Mod to Work?
The short answer is: it depends entirely on whether the mod is client-side or server-wide (authoritative). Understanding this distinction prevents hours of troubleshooting in Discord lobbies:
| Mod Classification | Who Needs It Installed? | Examples | Vanilla Compatibility |
|---|---|---|---|
| Client-Side Only | Only the individual player | FOV sliders, HUD customization, FPS uncappers, custom flashlights | 100% Compatible with unmodded vanilla players |
| Host-Authoritative | Only the lobby host (server) | Lobby player cap expanders (MoreCompany), spawn rate modifiers | Vanilla clients can join if host runs network sync patch |
| Synchronized Asset Mods | EVERY player in the lobby | Custom moons, custom monsters, new weapons, custom emote suites | Incompatible; missing assets cause instant lobby crashes |
When asking does everyone need thunderstore mods for a moid to work, if the mod introduces new 3D models, sound files, or alters game rules (such as enemy pathfinding or damage calculations), all lobby participants must install identical mod versions. If one player lacks the assets, the Unity engine will throw continuous NullReferenceException errors or immediately disconnect the un-synced client.
Client-Side vs. Host-Authoritative Mods in Thunderstore
To avoid manual coordination headaches, modern mod managers provide Profile Import/Export Codes:
- Exporting a Modpack: The lobby host configures the exact mod collection in r2modman or Thunderstore App. Navigate to Settings > Profile > Export profile as code.
- Distributing the Key: The host shares the generated 8-to-12 character alphanumeric string with friends.
- One-Click Import: Friends click Import new profile > From code, paste the string, and the mod manager automatically downloads the exact mod versions and configuration files, ensuring 100% parity across the squad.
Is Thunderstore Safe? Malware Scanning and Sandboxing Practices
Thunderstore is a legitimate, reputable modding ecosystem. Unlike sketchy third-party file-sharing websites riddled with fake download buttons and adware, Thunderstore incorporates modern security safeguards:
- Automated Malware & Virus Analysis: Every uploaded package is scanned upon submission using multi-engine antivirus heuristics. Known malicious signatures or suspicious obfuscated payloads are flagged and quarantined.
- Sandboxed Profile Architecture: Mod managers like r2modman do not overwrite core game files in your Steam directory. They use the BepInEx doorstop library to load mods dynamically in memory when launching via the manager. Clicking “Start Vanilla” launches the unmodded game with clean, pristine files.
- Open-Source Transparency: The majority of popular Thunderstore mods have public GitHub repositories, allowing community developers to audit the underlying C# and Unity code.
Safety Checklist Before Installing Any Mod
- Download Count and Thumbs Up: Stick to verified mods with thousands of downloads and positive community ratings.
- Verify Authorship: Check that the mod creator is the recognized author (e.g., NotSpooking, RugbugRedfern, Sligili) rather than a newly registered account re-uploading popular packages.
- Never Run External Executables: Legitimate Thunderstore mods are distributed as
.dllassemblies packaged with manifest JSONs. Avoid any mod that instructs you to execute a separate.exeor.batinstaller.
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