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SlayTheSpire2.LAN.Multiplayer.Reforged

LAN Multiplayer

A community-maintained fork of SlayTheSpire2.LAN.Multiplayer for Slay the Spire 2.

This project updates the original LAN Multiplayer mod to remain compatible with newer versions of Slay the Spire 2 while preserving its original gameplay and networking experience.

It replaces the standard online transport path with a direct ENet connection, allowing players on the same local network—or connected through a virtual LAN—to host and join multiplayer games without relying on Steam lobbies or external matchmaking services.

This is an unofficial community project and is not affiliated with Mega Crit.

Warning

Do not enable the original SlayTheSpire2.LAN.Multiplayer mod and LAN Multiplayer: Reforged at the same time. Remove or disable the original mod before installing this fork.

Features

  • Host multiplayer games over a local network
  • Join multiplayer sessions using an IP address and port
  • Supports Standard, Daily and Custom multiplayer runs
  • Continue existing LAN multiplayer saves
  • Uses separate LAN multiplayer save data
  • Displays available local and public network addresses
  • Click an address to copy it
  • Supports physical LAN and virtual LAN connections
  • Uses the game's existing multiplayer synchronization systems
  • Includes translated LAN settings and interface text
  • Supports configuration through ModConfig when installed

Requirements and Compatibility

Required:

  • Slay the Spire 2
  • Windows
  • BaseLib
  • The same game version on every computer
  • The same version of LAN Multiplayer: Reforged on every computer
  • The same gameplay-changing mods, mod versions and load order on every computer

Optional:

  • ModConfig

Tested with:

Slay the Spire 2 v0.107.1
Godot 4.5.1 Mono
.NET 9

BaseLib is a required dependency. The mod will not load correctly if BaseLib is missing or disabled.

Because Slay the Spire 2 is still being actively updated, future game versions may change internal APIs and require this mod to be rebuilt or updated.

Installation

  1. Install BaseLib and confirm that it is enabled.
  2. Download the latest LAN Multiplayer: Reforged release.
  3. Extract the archive.
  4. Copy the included mods folder into the Slay the Spire 2 installation directory.

Example:

Slay the Spire 2/
├─ SlayTheSpire2.exe
└─ mods/
   ├─ BaseLib/
   └─ SlayTheSpire2.LAN.Multiplayer.Reforged/
      ├─ mod_manifest.json
      ├─ SlayTheSpire2.LAN.Multiplayer.Reforged.dll
      └─ SlayTheSpire2.LAN.Multiplayer.Reforged.pck
  1. Start the game.
  2. Confirm that both BaseLib and LAN Multiplayer: Reforged are loaded.
  3. Confirm that the game reports that it is running modded.

Do not keep the original LAN Multiplayer mod enabled alongside the Reforged version.

Hosting a LAN Game

  1. Start Slay the Spire 2.
  2. Open the multiplayer menu.
  3. Select the LAN hosting option.
  4. Choose Standard, Daily or Custom mode.
  5. Share the displayed address and port with the other players.

The host must keep the game open while other players connect and throughout the multiplayer session.

Joining a LAN Game

  1. Start Slay the Spire 2.
  2. Open the multiplayer join screen.
  3. Locate the LAN connection panel.
  4. Enter the host's address.
  5. Press the LAN join button.

Supported address formats include:

192.168.1.100
192.168.1.100:33771
localhost

When no port is entered, the configured default LAN port is used.

Playing Through a Virtual LAN

The mod can also work through virtual LAN software, provided that every player can directly reach the host's virtual IP address.

Common options include:

  • Tailscale
  • ZeroTier
  • Radmin VPN
  • Hamachi

Enter the host's virtual LAN address in the join screen exactly as you would enter a normal local IP address.

A virtual LAN service does not automatically guarantee connectivity. Firewall rules, network profiles and routing settings may still need to be adjusted.

Configuration

BaseLib is required for this mod.

ModConfig is optional. When ModConfig is installed, the following LAN options are available through its configuration interface:

  • Default LAN port
  • Maximum player count
  • Connection timeout
  • Default server address
  • Remember last joined address
  • Player name
  • Preferred Net ID

Without ModConfig, LAN Multiplayer: Reforged continues to use its original in-game settings interface.

Configuration values continue to use the mod's existing LAN settings storage, regardless of whether they are changed through ModConfig or the fallback settings interface.

ModConfig may have its own dependencies and installation requirements.

Mod Compatibility

All players should use the same:

  • Game version
  • LAN Multiplayer: Reforged version
  • BaseLib version
  • Gameplay-changing mods
  • Mod versions
  • Mod load order

Cosmetic differences may work, but identical installations are strongly recommended.

Differences in cards, relics, characters, events, enemies, acts or synchronization-related patches can cause connection failures or desynchronization.

For troubleshooting, first test with only these mods enabled:

BaseLib
LAN Multiplayer: Reforged

Add other mods back only after confirming that the basic LAN connection works.

Localization

The Reforged resource package includes localized interface entries for the LAN multiplayer menus and settings.

Localization resources, paths and keys have been migrated to the Reforged project identifier:

SlayTheSpire2.LAN.Multiplayer.Reforged

The included PCK uses the Godot 4.5.1 Pack V3 format.

If raw localization keys are displayed instead of translated text, verify that the Reforged PCK is installed beside the DLL and that an older LAN Multiplayer PCK is not being loaded.

Building from Source

Prerequisites

  • .NET 9 SDK
  • Git
  • An installed copy of Slay the Spire 2
  • BaseLib or the required BaseLib assembly references
  • Required game assemblies from a local Slay the Spire 2 installation

Clone the repository:

git clone https://github.com/PageSecOnd/SlayTheSpire2.LAN.Multiplayer.Reforged.git
cd SlayTheSpire2.LAN.Multiplayer.Reforged

Build the project by running:

build.bat

The compiled DLL will normally be located at:

SlayTheSpire2.LAN.Multiplayer.Reforged/bin/Release/net9.0/

The project references assemblies from a locally installed copy of Slay the Spire 2. These game assemblies are not included in the repository and must not be redistributed.

Troubleshooting

The mod does not appear in the game

Verify that:

  • The mod folder is placed directly inside the game's mods directory
  • The folder contains mod_manifest.json
  • BaseLib is installed and enabled
  • The required DLL and PCK files are present
  • The original LAN Multiplayer mod is disabled

The mod reports a missing dependency

Confirm that BaseLib is installed, enabled and compatible with the current game version.

BaseLib is required. LAN Multiplayer: Reforged cannot be used as a standalone mod without it.

Settings display untranslated localization keys

For example:

settings_ui.SlayTheSpire2.LAN.Multiplayer.Reforged.HOST_PORT

Verify that:

  • SlayTheSpire2.LAN.Multiplayer.Reforged.pck is installed
  • The PCK is located beside the mod DLL
  • The PCK uses the Godot 4.5.1 Pack V3 format
  • The original LAN Multiplayer PCK is not being loaded
  • The DLL and PCK come from the same release

The client cannot connect

Verify that:

  • The host has already opened a LAN lobby
  • The IP address is correct
  • The port is correct
  • Both computers are on the same LAN or virtual LAN
  • Windows Firewall allows the game
  • The host and client use the same game version
  • The host and client use the same mod version
  • The host and client use compatible BaseLib versions

Connection timed out

A timeout usually indicates that the client cannot reach the host.

Check that:

  • The host is still in the multiplayer lobby
  • The host address is reachable
  • The selected port is not blocked
  • The virtual LAN connection is active
  • A VPN is not routing the connection through the wrong interface
  • The connection timeout value is not set too low

Players disconnect or desynchronize

Temporarily disable every other gameplay-changing mod and test again.

If the problem disappears, re-enable mods in small groups until the incompatible mod is identified.

All participants should use matching game versions, mod versions, BaseLib versions and mod load order.

Screenshots

Screenshot 1

Screenshot 2

Screenshot 3

Screenshot 4

Screenshot 5

Screenshot 6

Contributing

Bug reports and pull requests are welcome.

When reporting a problem, include:

  • Game version
  • LAN Multiplayer: Reforged version
  • BaseLib version
  • ModConfig version, when installed
  • Full game log
  • Host and client operating systems
  • Installed mod list
  • Steps required to reproduce the issue

Source repository:

https://github.com/PageSecOnd/SlayTheSpire2.LAN.Multiplayer.Reforged

Acknowledgements

This project is a fork of SlayTheSpire2.LAN.Multiplayer, originally created by kmyuhkyuk.

Original repository:

https://github.com/kmyuhkyuk/SlayTheSpire2.LAN.Multiplayer

The original LAN multiplayer implementation was created by kmyuhkyuk.

This fork builds upon that work with compatibility fixes, maintenance updates, BaseLib integration, optional ModConfig support and migrated Reforged localization resources.

The original project is licensed under GPL-3.0, and this fork continues to be distributed under the same license.

License

This project is licensed under the GNU General Public License v3.0.

See LICENSE for details.

About

Added Local network multiplayer feature interface, Custom host port and maximum players settings.

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LAN Multiplayer: Reforged v1.1.1 — Localization Hotfix Latest
Jun 24, 2026
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