Universal Sandbox is a creative open-world game where players have unlimited freedom to build, destroy, and interact with various elements. It features a physics-based environment with customizable objects, particles, and forces. Players can draw shapes, create structures, manipulate gravity, generate weather effects, and watch how everything interacts in real-time. The game offers a palette of materials with different properties (elastic, rigid, liquid, gas) and tools to combine them, allowing for endless experimentation and creative expression without objectives or limitations.