Forge your levels
Master your craft
A level editor for idTech4-based games, targeting HellCore, RBDOOM-3-BFG and dhewm3. Built for level designers who demand precision, power, and total control.
Power tools for hellish performance
Every feature designed for maximum productivity and ergonomy for level designers.
Multi-Format Map Support
Open and edit Quake 1, Quake 2 and Valve 220 MAP formats. Import Source engine VMF maps. Experimental OpenStreetMap importer for real-world geometry.
3D Camera Workflow
Create and manipulate brushes directly in the 3D view. Alt+scroll to resize faces, Ctrl+scroll for symmetric resize, Shift+scroll for trim brushes.
Advanced CSG Tools
Intersect, Passable, Shell, and Bridge operations. Plus stairs, arch, cable, and corner patch generators for complex geometry.
Command & Insert Palettes
Quick access to editor actions via command palette. Learner mode shows keyboard shortcut hints directly in the 3D viewport.
Visual Material Browser
Visual preview mode for browsing textures. Control the opacity of utility textures like clip and caulk in the viewport.
MCP Server for AI Agents
Built-in MCP server lets AI agents operate the editor programmatically: creating brushes, placing entities, and executing commands via natural language.
Check out our new features
New tools and workflows designed to make level editing faster and more intuitive.
Manipulate Brushes in 3D
Create brushes directly in the 3D viewport with LMB drag. Resize or extrude with mouse scroll. No more switching between 2D orthographic views just to draw basic geometry. Select and create in one fluid motion.
Built-in Geometry Generators
HellForge ships with procedural generators for stairs, arches, terrain, cables, corner patches, and sweep extrusions. Plus array and scatter tools to duplicate and distribute geometry across your level.
New CSG Operations
Exciting new CSG operations, including Intersect, Bridge, Seal, Passable and Shell. Build complex architecture faster with powerful boolean and shaping tools.
Decal Shooter
Point-and-click tool for placing decal textures onto surfaces directly from the 3D camera view. No more fiddling with manual alignment. Just aim and shoot decals where you want them.
Tile-based Map Designer
Grid-based map layout tool for rapid prototyping. Place and arrange tile pieces to quickly sketch out level layouts before committing to detailed geometry.
Full scripting API. Automate everything.
Like Blender, HellForge exposes a complete Python scripting interface. Access the SceneGraph, Shader System, Virtual File System, and more. Write scripts to automate repetitive tasks, create custom tools, or build entirely new workflows. HellForge also includes an MCP server that lets AI agents operate the editor programmatically for AI-assisted level design.
import darkradiant as dr
for node in GlobalSelectionSystem.getSelectedBrushNodes():
c = node.getWorldAABB().origin
e = GlobalEntityCreator.createEntity(
GlobalEntityClassManager.findClass("light"))
e.getEntity().setKeyValue("origin",
f"{c.x()} {c.y()} {c.z() + 128}")
e.getEntity().setKeyValue("light_radius", "256 256 256")
e.getEntity().setKeyValue("_color", "1 0.8 0.6")
e.addToContainer(GlobalMap.getWorldSpawn())
print(f"Added 1 light")AI-assisted level design with MCP Server
HellForge includes a built-in MCP server that allows AI agents to operate the editor programmatically. This enables entirely new workflows where an agent can build and modify maps using natural language instructions.
Combined with the Python scripting API, the MCP server makes HellForge one of the most extensible and automatable level editors available. Let AI handle the repetitive work while you focus on creative decisions.
Forged in HellForge
Maps created by our community of dedicated level designers.
Ready to descend?
Download HellForge and start building. Free, open source under GPLv2, forever.