Anvil Level Design is a free, open-source Blender add-on inspired by TrenchBroom that streamlines game level prototyping. It adds a dedicated level design workspace with game-engine-style navigation (WASD + right mouse), one-click texture application, UV fitting tools, grid snapping, and a hotspot mapping system that automatically applies textures from an atlas based on face orientation. The tool requires Blender 5.1 or higher, is GPL licensed, and exports to glTF. It significantly speeds up blocking out levels directly inside Blender.

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