The Forge: the Shards of Stone map editor

The Forge is the free map editor for Shards of Stone, running in your browser. Paint terrain, place units, write triggers with point-and-click sentences, change unit stats, then test your map in the real game.

• A 3D viewport with terrain painting and elevation.
• Modules for terrain, triggers (events, conditions and actions), unit and building data, players and teams, cutscenes, and validation.
• Test Map (Ctrl+F9) launches the map in the game.
• Drafts save in your browser without an account; publishing a map for others to play needs a free account.
• Import and export map JSON and standalone .sosmod mod packages, and copy the map as context for an AI assistant.

Guides: /docs/map-editor. Community maps: /custom-games.