sts2-lan-multiplayer

Fork of kmyuhkyuk/SlayTheSpire2.LAN.Multiplayer

A mod for Slay the Spire 2 that adds LAN (Local Area Network) multiplayer, allowing you to play with friends over a local network without requiring Steam multiplayer services.

Features

• LAN Host & Join — Host or join multiplayer sessions over your local network
• Multiple Game Modes — Supports Standard, Daily, and Custom runs
• Configurable Settings — Custom host port, max players, and player name
• Multi-language Support — 14 languages: English, Simplified Chinese, Japanese, Korean, French, German, Spanish, Italian, Polish, Portuguese, Russian, Thai, Turkish, Latin American Spanish
• Cross-platform — Works on Windows, macOS, and Linux

Installation

1. Download the latest release archive
2. Extract to get the  mods folder
3. Place the  mods folder into your Slay the Spire 2 game directory

The resulting directory structure should be:
<Slay the Spire 2>/
└── mods/
    └── SlayTheSpire2.LAN.Multiplayer/
        ├── SlayTheSpire2.LAN.Multiplayer.dll
        ├── mod_image.png
        └── mod_manifest.json

Usage

1. Launch the game (it will show "RUNNING MODDED!" if installed correctly)
2. From the main menu, select Multiplayer
3. Host: Click "LAN Host" to start a LAN session (your IP will be shown to share with friends)
4. Join: Click "Join Friends" and enter the host's IP address to connect

Build From Source

Prerequisites

• .NET 9 SDK
• Installed Slay the Spire 2
• 7-Zip ( 7zz on macOS /  7z on Windows/Linux) for  .7z packaging (optional, falls back to  .zip)

macOS / Linux

# Default (auto-detects game installation)
./scripts/build-package.sh

# Custom game install path
STS2_INSTALL_DIR="$HOME/Library/Application Support/Steam/steamapps/common/Slay the Spire 2/SlayTheSpire2.app/Contents/Resources" \
./scripts/build-package.sh

# Direct data folder override
STS2_DATA_DIR="$HOME/Library/Application Support/Steam/steamapps/common/Slay the Spire 2/SlayTheSpire2.app/Contents/Resources/data_sts2_macos_arm64" \
./scripts/build-package.sh

Windows

# Default (auto-detects game installation)
dotnet build SlayTheSpire2.LAN.Multiplayer/SlayTheSpire2.LAN.Multiplayer.csproj -c Release

# Custom game path
dotnet build SlayTheSpire2.LAN.Multiplayer/SlayTheSpire2.LAN.Multiplayer.csproj -c Release /p:Sts2InstallDir="D:\SteamLibrary\steamapps\common\Slay the Spire 2"

# Direct data folder override
dotnet build SlayTheSpire2.LAN.Multiplayer/SlayTheSpire2.LAN.Multiplayer.csproj -c Release /p:Sts2DataDir="D:\SteamLibrary\steamapps\common\Slay the Spire 2\data_sts2_windows_x86_64"

Build Output

• Package:  artifacts/SlayTheSpire2.LAN.Multiplayer.Release_<version>.7z (or  .zip)
• Extracted content:  artifacts/mods/SlayTheSpire2.LAN.Multiplayer/

Compatibility

• Game version: 0.103.2
• Mod version: 1.6.3
• Platforms: Windows (x86_64), macOS (ARM64 / x86_64), Linux (x86_64)