Crawlspace 2 Multiplayer Mod

A co-op multiplayer mod for Crawlspace 2 VR horror game. Play through the terrifying vents with a friend!

Features

• Steam Lobby System - Easy matchmaking via Steam friends or lobby codes
• Full Player Sync - See your partner's position, head, and hand movements
• Proximity Voice Chat - Built-in 3D positional voice (hear them from their location)
• Monster Sync - Coordinated monster behavior across players
• Puzzle Sync - Progress syncs between players
• Ghost System - If you die, become a ghost and watch your partner
• Streamer-Friendly - Hide UI with Insert key, lobby codes hidden by default

Monster Behavior in Co-op

Different monsters have different sync strategies:

Monster	Behavior
Smile, Jeff, Sparky	Triggers at same time for all players, but each player has their OWN monster chasing THEM. Each player must defend themselves.
Henry, Harold	Fully synced - host controls position, same monster for everyone
Clown	Fully synced - which clown is active, attack state. Only kills players in the main room.
Paintings	Fully synced - which paintings are scary, timer, entity spawns. Only kills players in the main room.

Installation

Requirements

• Crawlspace 2 on Steam
• BepInEx 5.x for Unity

Steps

1. Install BepInEx to your Crawlspace 2 folder
2. Download the latest release from NexusMods
3. Copy files to your game folder:
   • Crawlspace2MP.dll → BepInEx/plugins/
   • Facepunch.Steamworks.Win64.dll → BepInEx/plugins/
   • steam_api64.dll → game root folder (next to the .exe)
4. Launch the game through Steam

Note: steam_appid.txt is auto-generated on first run.

How to Play

1. Host: Click "Host Game" in the MP window
2. Join: Either:
   • Click "Invite Friends" to send Steam invites
   • Share the lobby code (click "Show Code" then "Copy")
   • Friend can right-click you in Steam and click "Join Game"
   • Use the Friends List in the UI to see friends playing and join directly

Controls

• Insert - Toggle UI visibility (for recording/streaming)
• Voice chat is always-on when enabled

Building from Source

Requirements

• .NET SDK (for .NET Framework 4.7.2)
• Game DLLs in lib/ folder (see below)

Setup

1. Clone the repo
2. Copy required DLLs from your game installation to lib/:
   • From VRFighter_Data/Managed/: Unity DLLs, Assembly-CSharp.dll
   • From BepInEx/core/: BepInEx.dll, 0Harmony.dll
3. Build: dotnet build --configuration Release

The mod auto-deploys to your game folder on build (configure path in .csproj).

License

MIT License - see LICENSE

Disclaimer

This is an unofficial mod and is not affiliated with the developers of Crawlspace 2.