Physics Sandbox invites you to experiment with a variety of interactive materials and discover how they behave. The core objective is simple: play freely, combine elements, and observe the resulting physical reactions. You can handle fine powders and sand, pour liquids, watch flowing lava, and break apart solids that split on impact. Gases are also present, adding another layer of dynamic movement. The simulation uses marching squares to create smooth, polished visuals, giving every interaction a clean look. Build your own custom materials to further tweak the experience. Whether you're testing stability or creating chaotic flows, Physics Sandbox offers a hands-on playground for creative scientific curiosity.