Black Mesa Half Life Custom Moon and Interior
This mod adds a custom moon based off of Black Mesa Research facility as well as a custom interior that has over 100+ room tiles to use for dungeon generation for Lethal Company
Current Features
- Over 100+ tiles to be used for generation leading to each playthrough being a new experience for the interior
- HEV charging stations will randomly generate in the dungeon allowing each player to charge 1 device (two charging stations will generate per day)
- Interactable Light Switches in some office rooms (more to come)
- Full custom exterior moon comes with this mod and has lots of places to explore to get to the fire exits
Coming Soon (once we sort out what is wrong with the config and dll)
- Security Surveilance system in main entrance security room lets you keep an eye on possible hostile creatures trying to sneak up on you (but watch your back to the doorway behind you)
- Handheld TVs located in the Security Room lets you broadcast what you see to the security terminal
- Use this interior on other moons OR other interiors with this custom moon
So sorry for having to revert the changes, but I want people to be able to play it properly without having it crash.
Screenshots

FAQ
Q: When is the full release going to be?
A: I am not sure when it will get to the state where I deem it "complete" as I am a perfectionist sometimes and I have already sank 200+ hours into this project and in my head there is still a lot I want to add so it is hard to give an estimate
Q: Can monsters crawl through the vents?
A: Yes! They all can go through the ventilation ducts like any other flooring, but eventually I would like to restrict it to not let Brackens, Coilheads, Nutcrackers, and Masked to go through them.
Q: It is very dark, are you going to add more lights?
A: Yeah lighting take forever so it is something I am actively working on, as well as adding fucntional light switches to the rooms
Q: The performance is bad sometimes without Cullfactory, are you going to fix that?
A: Yeah this is my first time making anything in Unity, let alone a mod for lethal company so I have a lot of optimizations to do still. To help with performance I highly recommend CullFactory and PathfindingLagFix to play with this as it helps with it a lot for now.
Known issues that are being actively worked on
- Mod Conflicts that tend to spawn you in the wall of the ship at spawn (please send me your logs if you can)
- Lots of lighting issues on faces/surfaces of objects/rooms
- No hazards like turrets/landmines on custom moon due to issues with spawns for them
- some desync issues with vent doors and doors in general sometimes (looking into this is top priority)
- secret vent area has some minor collision issues that I will fix next update
- Sometimes Fire Exits on the moon surface cannot find their interior counterpart + sometimes only 2 interior Fire Exits spawn when there are 3 exterior Fire Exits leading to warping to wrong Exit
- no random props per tile yet (I am saving global props for last since prop dressing over 100+ tiles will take forever lol)
Tips for most fun
- Bring as big of a group as you can
- Have someone stay in the security room
- bring lots of flashlights and walkies
- Try to remember the path you take as it is easy to get lost >:)
Planned Features
- More functional Light switches for rooms
- Functioning Resonance Cascade chamber with the apparatus powering it (will turn off all power to the facility)
- More shortcuts for the larger tiles
- Charging suit stations for health (Health station will fill up to 1 players health)
- Custom Scrap based on Half Life
- Custom Sound FX and Ambient noises
- Steam Vents
- Emergency Doors (operatable by the ship console)
- More room tiles >:)
Support my projects
These projects take a lot of time so it is always nice to have a way for people to support the things I work on :)
https://ko-fi.com/plasteredcrab
Credits
- Major-MoreInteriors for his tutorial series I used to learn a lot of the basics
- Batby for their amazing work with LethalLevelLoader
- PureFPSZac for helping make the config and first dll for this mod and testing much of the mod as it helped a lot!
- AudioKnight for his tutorial series on making a custom Moon
- SherlockJake for working with me to figure out how to get the asset bundles to build as well as help get this all started!
- SkullCrusher for sharing his code for water that damages over time (I used it for my toxic pool)
- The amazing Interior modders out there who helped with random bugs I came across (Cobertos, Lavender, Drako, Zersal, RosiePies, MusicalSleep, Badhamknibbs, Goldblaze, etc)
- Titan for taking the time to show me how to rip Black Mesa Assets