Falling Sand

Description

A real-time, cell-based physics sandbox where you place different materials on a grid and watch them interact according to their own physical rules. There are no goals or scores, just a canvas to experiment on.

🧪 Elements & Behaviors

🟡 Sand

Sand is a solid granular material. It falls straight down due to gravity. If the cell directly below is blocked, it attempts to slide diagonally left or right. This produces realistic pile-up and slope behavior. Sand does not interact chemically with water or walls, it simply settles on top of them.

🔵 Water

Water is a liquid material. It falls downward and, when blocked, spreads horizontally in both directions to fill available space. Water does not compress or stack, it always seeks the lowest available cell. It reacts chemically with both lava and plants.

⬜ Wall

Wall is a static solid material. It does not move and is not destroyed by any interaction (except lava). Use walls to build containers, channels, and barriers to shape the behavior of other elements.

🔴 Lava

Lava is a liquid material that moves like water (falls and spreads), but has destructive chemical properties. When lava contacts any other material (sand, water, plant), an interaction occurs. Lava destroys most materials on contact, replacing them with itself. The single exception is water, see the interaction table below.

🟢 Plant

Plant is a static solid material that does not move on its own. However, it is reactive: when water occupies an adjacent cell, the plant propagates, a neighboring empty or water cell becomes a new plant cell. This causes plants to grow and spread when supplied with water. Lava destroys plants on contact.

🔴 Lava + 🟡 Sand	Lava remains, sand is destroyed	Lava consumes the sand cell
🔴 Lava + 🔵 Water	Both become ⬜ Wall	Neither survives; a solid wall is formed at the contact point
🔴 Lava + 🟢 Plant	Lava remains, plant is destroyed	Lava burns through plant cells
🔵 Water + 🟢 Plant	Water is converted, plant spreads	The water cell becomes a new plant cell

https://github.com/FatihBoz/FallingSand