Quick start

1. Open FallingSand_GN.blend (2D) or FallingSand3D_GN.blend (3D) in Blender 4.5 LTS or newer. No add-on is needed.
2. Press Space in the 3D Viewport to play. Go back to frame 1 to reset the simulation.
3. While it plays, select one of the "BRUSH ..." objects next to the canvas or box and move it with G to paint.
4. Change what a brush or emitter makes in its FS Emitter modifier: Element, Mode, Rate, Start and End Frame.

Level shapes, emitters, every modifier input, the twelve elements, rendering, baking and performance tips are covered in the full documentation: blenderprocedural.github.io/falling-sand/docs.html