Falling Sand

Pick an element — sand, water, fire, oil, plant — and start pouring it onto the canvas. Particles pile up, flow around each other, and react: fire ignites oil, water douses flame, plants grow where moisture reaches them. Each combination behaves a little differently, and discovering those reactions is the whole point.

There's no score, no timer, no objective. That's deliberate. Interactive simulations like this one are built for tinkering, and Falling Sand rewards the kind of curiosity that asks "what happens if I drop lava on ice?" For something that pushes particle physics further, Sandbox Physics adds stone and plant mechanics in a similar vein.

Controls are minimal — select an element, click or click-and-drag to place it — so it runs well on both desktop and touchscreen. A larger brush size makes for faster, messier experiments, while a fine setting lets you build careful structures before watching them collapse.