SandWorld - Particle simulator

SandWorld is a living falling sand physics sandbox. Paint sand, fire, water, lava, and dozens of other elements onto the screen and watch them fall, flow, burn, freeze, dissolve, and react in real time.

FILL THE WORLD WITH REACTIVE ELEMENTS
Choose from 90+ materials:
• Powders: Sand, Gunpowder, Ash, Coal, Salt, Snow, Cement, Sodium, Phosphorus, Thermite, Baking Soda, Dry Ice, and more.
• Liquids: Water, Oil, Acid, Lava, Slime, Honey, Mercury, Gasoline, Milk, Napalm, and more, each with its own density and flow, so heavier liquids sink through lighter ones.
• Gases: Steam, Smoke, Helium, Methane, Toxic Gas, Oxygen, Hydrogen, and more, rise and drift until they dissipate.
• Solids: Stone, Wood, Ice, Metal, Glass, Brick, Concrete, Diamond, Gold, Obsidian, and a Mirror that redirects laser beams.
• Special: Fire that spreads and burns, TNT that detonates, a Black Hole that swallows everything nearby, a Plasma Lamp that arcs sparks, linked Portals that teleport anything that falls through them, and colored Lasers you can route around your build.

LAUNCH WEAPONS AND FIREWORKS
Sling Rockets, Bombs, Nukes, Grenades, Arrows, Meteors, and a Machine Gun into your world, call down Lightning, or launch fireworks in six colors that climb and burst into rings, peonies, willows, palms, crackles, or chrysanthemums, in five sizes.

DRIVE, FLY, AND SAIL
Place cars, boats, and an airliner for everyday traffic, or bring in military hardware, a bomber, a warship, a tank, and an atomic bomber that drops real ordnance, and watch them roll, sail, or fly through your world.

GROW A GARDEN, LEARN THE CHEMISTRY
Plant seeds in soil near water and watch them sprout and grow. Discover real chemistry as you play: acid dissolves stone, sodium pops in water, baking soda and vinegar fizz, thermite melts metal into lava. An in-app Reactions screen explains every interaction, so you can learn the rules behind the chaos.

EXPLORE GENERATED WORLDS
Generate a new map from ten themes, Castle, Islands, Jungle, Garden, Zoo, City, Armageddon, Underground, War, and Arctic, each with its own terrain and surprises, including the War theme's dueling fortified bases with their own cannons.

SOLVE HAND BUILT PUZZLES
Beyond free play, test your understanding of the simulation in puzzle challenges that ask you to fill a zone, protect a zone from a hazard, or route a material to a target, all within a limited budget.

SEE THE WORLD DIFFERENTLY
Switch between Normal, Day, Night, Thermal, and Blueprint view modes to watch your creations glow in the dark or reveal heat as false color.

YOUR WORLD IS SAVED
Your entire canvas, every grain, every fire, every creature, is automatically saved when you close the app and restored exactly as you left it.

Most materials, weapons, maps, and tools are free to try. Unlock the full material roster, extra maps, and a tiny precision-brush world through optional in-app purchases.

Whether you want to build elaborate chain reactions, grow tiny ecosystems, or just melt, freeze, and explode things for fun, SandWorld turns your screen into a tiny reactive universe.