Marble by World Labs is a breakthrough AI world-generation tool that creates fully navigable, high-fidelity 3D environments from simple text prompts, images, or video inputs. Built on cutting-edge spatial AI and multimodal world-model technology, Marble allows creators, designers, marketers, developers, and students to generate immersive 3D spaces in minutes without needing advanced modelling skills. From game levels and VR environments to product showcases and architectural concepts, Marble unlocks a new era of AI-powered 3D creativity. This guide by Heuristic Academy explores its features, use-cases, pricing, and how to get started.