What is Sand Falling Simulator?

Sand Falling Simulator is an interactive particle physics playground where you can draw sand, water, fire, and walls on a canvas and watch them interact in real time. Built on cellular automaton principles, each particle follows simple rules that create surprisingly realistic and mesmerizing behaviors.

Digital Sandbox: Think of it as a digital sandbox with superpowers. Sand falls and piles up naturally. Water flows and spreads like a real liquid. Fire rises, burns nearby sand, and evaporates water into smoke. You control the gravity direction by moving your mouse or tilting your phone.

Why It's Fun

Satisfying Physics

Watch thousands of particles interact with realistic gravity and collision detection

Multiple Elements

Combine sand, water, fire, and walls for endless creative possibilities

Gravity Control

Tilt gravity with your mouse or device gyroscope for dynamic effects

Preset Scenes

Start with an hourglass, funnel, or maze and watch particles flow

Relaxing Experience

The gentle sound of falling sand creates a calming atmosphere

Browser-Based

Runs 100% in your browser - no plugins, no data sent to servers

Privacy First: The simulation runs 100% in your browser using HTML5 Canvas. No data is sent to any server, no plugins required, and it works on both desktop and mobile devices.

Table of Contents

1. What is Sand Falling Simulator?
- 1.1. Why It's Fun
2. How to Use Sand Falling Simulator
3. Features
4. Frequently Asked Questions

How to Use Sand Falling Simulator

Choose a Tool

Select one of the five tools from the toolbar at the top:

Sand - Draw sand particles in various colors
Water - Draw water that flows and spreads
Fire - Draw fire that rises and burns
Wall - Draw solid barriers that block particles
Eraser - Remove particles from the canvas

Pick a Sand Color

When using the Sand tool, choose from five color options: classic sand, red, white, rainbow, or neon. The color selector is visible only when the Sand tool is active.

Draw on the Canvas

Click or drag on the canvas to place particles. Adjust the brush size slider to control how many particles you place at once.

Control Gravity

Move your mouse across the canvas to subtly tilt the direction of gravity. On mobile devices, physically tilt your phone to change the gravity direction. Use the gravity strength slider to adjust how fast particles fall. Press the Flip Gravity button to reverse gravity entirely.

Use Advanced Features

Continuous Pour - Toggle this to create a steady stream of particles at your cursor position
Sound - Enable ambient sound that reacts to particle movement
Save Image - Download your creation as a PNG file
Reset - Clear the entire canvas and start fresh

Try Preset Scenes

Click one of the preset buttons at the bottom of the screen to load a pre-built scene:

Hourglass

A classic hourglass filled with sand

Funnel

A funnel shape that channels particles through a narrow opening

Maze

A random maze for particles to navigate through

Features

Five Drawing Tools

Switch between Sand, Water, Fire, Wall, and Eraser tools. Each material has unique physics behaviors that create interesting interactions when combined.

Sand Color Palettes

Choose from five distinct sand color options. Classic golden sand for natural scenes, red and white sand for variety, rainbow for colorful creations, and neon for vibrant particle art.

Realistic Water Physics

Water flows downward and spreads horizontally like a real liquid. Sand naturally sinks through water, while fire evaporates water into rising smoke clouds.

Fire and Smoke

Fire rises upward with flickering colors that shift from white-hot to orange to red as it cools. Nearby sand catches fire and burns, while water hit by fire turns into smoke that drifts upward and fades away.

Gravity Control

The direction of gravity subtly follows your mouse cursor, letting you guide particles across the canvas. On mobile devices, tilt your phone to control gravity with the built-in gyroscope. Use the Flip Gravity button to completely reverse the direction.

Continuous Pour Mode

Toggle continuous pour to create a steady stream of particles at your cursor position. The stream follows your mouse as you move, creating flowing rivers of sand, water, or fire.

Adjustable Controls

Fine-tune your experience with two sliders. The brush size slider controls how many particles you place with each stroke. The gravity strength slider adjusts how fast particles fall and settle.

Preset Scenes

Load pre-built structures with a single click. The Hourglass preset creates a classic sand timer with sand ready to flow. The Funnel channels particles through a narrow pipe. The Maze generates a random obstacle course for particles.

Sound Effects

Enable ambient sound that reacts to particle movement. The volume automatically adjusts based on how many particles are actively moving, creating an immersive audio experience.

Save Your Creation

Capture your particle art as a PNG image with the Save button. The downloaded image preserves the exact state of your canvas including all particles, walls, and the background.

Frequently Asked Questions

How do I control where the sand falls?

Move your mouse across the canvas to tilt gravity in that direction. Sand and other particles will drift toward the side of the canvas where your cursor is. On mobile, tilt your device to achieve the same effect.

What happens when fire meets water?

Fire evaporates water into smoke. The smoke rises upward, drifts to the side, and gradually fades away. This interaction makes for interesting visual effects when you pour water near fire.

Can fire spread to sand?

Yes. Fire has a small chance of igniting adjacent sand particles, causing the fire to spread. The newly ignited sand burns and eventually turns into smoke that dissipates.

Why does sand sink through water?

This simulates realistic density behavior. Sand is heavier than water, so it sinks to the bottom while water rises to the top. This creates natural layering effects.

What is Continuous Pour mode?

When enabled, clicking and holding on the canvas creates a constant stream of particles at your cursor position. Unlike normal drawing, the stream continues even after you release the mouse button. Click the pour button again to stop.

How does the Flip Gravity button work?

Clicking Flip Gravity reverses the direction of gravity. All particles that normally fall down will instead fall upward. Click again to restore normal gravity. This affects sand, water, fire, and smoke.

Can I save my creation?

Yes. Click the camera icon to download your current canvas as a PNG image. The image captures the exact state of all particles, walls, and background at that moment.

Does this work on mobile devices?

Yes. The simulator works on both desktop and mobile browsers. On mobile devices, you get an additional feature: tilt your phone to control gravity direction using the built-in gyroscope.

Is there a limit to how many particles I can create?

There is no hard limit, but performance may slow down with very large numbers of particles. The particle counter at the bottom right shows the current count. For smooth performance, keeping the count under 50,000 is recommended.

What are the preset scenes?

Three pre-built structures you can load with one click. Hourglass creates a sand timer with sand in the top half. Funnel creates a cone shape that channels particles through a narrow pipe. Maze generates random walls for particles to navigate through.

Is my data private?

Yes. The entire simulation runs in your browser using HTML5 Canvas. No data is sent to any server. The Save Image feature creates the image locally on your device.