sandbox game, Garry's Mod, physics-based objects, interactive environment, user-generated content, creative building, prop manipulation, ragdoll posing, wiremod contraptions, multiplayer collaboration, Steam Workshop, custom textures, dynamic lighting, shadow effects, 3D models, contraption duplication, save and share, community-driven creations, in-game editor, physics simulation, sandbox mode, construct map, flatgrass map, tool gun, spawn menu, Lua scripting, addon integration, prop stacking, hinge creation, motorized joints, thruster attachment, balloon tool, no-clip mode, gravity toggle, sandbox creativity, player expression, virtual playground.