Falling Sand 2 — Lava and Acid Sandbox

About the Game

Falling Sand V2 is a denser laboratory version of the sandbox particle simulation game. There are no objectives or scores. The idea is simple: experiment, draw, and watch how different elements (like sand, water, salt, oil, fire, lava, and acid) interact with each other.

You can create barriers, pour water, ignite fires, and see how everything reacts in real time. Each element behaves according to simple rules inspired by real-world physics and chemistry.

Controls

• Left click: Draws with the selected element on the canvas.
• Mouse drag: Paints continuously as you move the mouse.
• Top toolbar: Select the type of element you want to use (wall, sand, water, salt, oil, plant, fire, lava, acid).
• Brush size slider: Change the size of the brush for more detailed or broad strokes.
• Save snapshot: Stores the current state in this browser so you can continue later.
• Continue snapshot: Restores the latest locally saved state.
• Download state: Exports a restorable JSON file with the current state.
• Download image: Saves a PNG image of the current canvas.
• Right click: (If enabled) Erase or draw with “empty” space.
• Reload: Resets the simulation.

Tips

• Try combining water and salt to create saltwater.
• Set plants on fire and watch them burn!
• Oil floats on water and catches fire easily.
• Lava hardens when it hits water, while acid cuts through plants and walls.
• Each round, new particles fall and interact with their neighbors.
• There are no levels, so just relax and have fun experimenting.

A sandbox for lava and acid experiments

Choose this version to move beyond the classic material set while keeping a drawing-first sandbox. Try a small pool of water and add lava nearby, or compare how acid affects separate samples of material. Save your scene before each comparison so you can restore the layout.

Prefer fewer controls? Play the classic falling sand game. Want ice, wax and persistent emitters? Open Falling Sand 3.