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Falling Sand
Draw materials on the box and watch the physics play out. Sand piles, water levels, oil floats, fire spreads, acid eats, plants creep, TNT goes boom.
Brush 3
Speed 2
Runs entirely in your browser. Drag on the box to draw the selected material. Water puts out fire and makes steam; steam condenses back to water. Oil floats on water and burns. Acid dissolves most things but not walls. Spouts endlessly drip whatever they’re made of — water, sand, oil, acid or fire. Plant creeps along water; ice melts near fire and slowly freezes water it touches. TNT sits still until fire touches it, then blows a hole, throws flames and sets off any other TNT in range.