Sand & Sky vs Grainfall

Sand & Sky is an endlessly satisfying particle physics sandbox — drop materials, watch them interact, and discover what happens when science meets creativity. Pour water and watch it fill every corner. Drop lava onto ice and forge obsidian. Ignite gunpowder and set off chain explosions. Build walls, draw mazes, and experiment unique materials that each behave according to their own rules. REACTIONS & COMBINATIONS Every material interacts with others in surprising ways. Water meets lava and creates stone. Lightning strikes sand and fuses it into glass. Acid dissolves almost everything. Discover all the reactions in the built-in Reactions guide. FEATURES · Realistic fluid simulation — liquids fill containers and accumulate naturally · Flip gravity in any direction — up, down, left, or right · Wind tool to push particles across the screen · Adjustable brush size and simulation speed · Undo button and sandbox clear · Unique sounds for every material Whether you're building elaborate contraptions, running experiments, or simply watching particles fall — Sand & Sky is the perfect zen sandbox to lose yourself in.

Grainfall is a falling sand toy. Pick a material, drag across the screen, and watch it react with whatever is already there. Sand piles up and slides back down. Dig a hole and water will find it. Oil floats on top of water, and oil burns. Plants drink from standing water and creep toward it. Fire spreads, leaves ash behind, and boils water into steam that drifts up, cools off, and comes back down as rain. There is no score and nothing to unlock by playing. What you get is twelve materials that all react to each other, and the fun is working out how. Build a glass tank and fill it with acid, since glass is the one thing acid cannot chew through. Pour lava into water and it sets into stone. Light one end of a gunpowder trail and follow it along. Hit record at any point and Grainfall turns what happened into a video, with sound built from the same events you just watched. Save a world and it keeps a picture of itself in your list. Send one to a friend as a small file and it opens straight into their copy. FREE • Sand, water, oil, plant, fire and wall • The full simulation, running at 60fps • Record and export video, with a small watermark in the corner • Your world saves itself and is waiting when you come back PRO - One time purchase • Six more materials: acid, glass, lava, ice, gunpowder, fireworks • Video export with the watermark gone • Save as many worlds as you want, name them, load them back • Send worlds to friends as .grain files • Four color themes • Tilt gravity, so leaning your phone pours everything sideways A FEW THINGS WORTH TRYING • Float oil on water and drop in a single flame • Fill a glass tank with acid • Pour lava into the sea and watch the steam come off it • Light a gunpowder trail at one end • Set off enough fireworks that the falling sparks catch your plants Every material makes its own sound. No account, no ads, nothing collected, and it all works offline.