1. Generate your world in Marble
Start in Marble: give it a text prompt, a single image, or a panorama, and it builds an explorable 3D scene with depth, geometry, and lighting. Refine it with Chisel until the space feels right.
2. Stitch scenes together (optional)
Need something bigger than one room? Combine multiple Marble scenes in the Marble Composer to build a larger, continuous world.
3. Export a collider mesh as .glb
Generate a mesh-based collider from your scene and export it as a .glb file. This is what gives your world walkable, physics-ready geometry inside the game.
4. Upload the world into Rosebud
Open your Rosebud project, switch to the Assets tab, and click Upload to bring in your .glb. (You can also start from a template on the Create screen for working scaffolding.)
5. Tell Rosie to build the game
Open the chat and ask Rosie, Rosebud's AI assistant, to build on top of your world — for example: "Add first-person movement, collision with this world, a goal to reach, and some ambient VFX." Keep iterating in plain language until it plays the way you want.
6. Make it multiplayer (optional)
Want co-op or competitive play? Remix the 3D Multiplayer Template to get an InstantDB app ID, drop it into your project's instant_db_config.js file, and ask Rosie for shared world changes, player presence, chat, or leaderboards. Full steps: how to add multiplayer to your game.
7. Publish and share
When it is ready, publish your project to get a play link or an embed you can drop anywhere. Your Marble world is now a game anyone can play in the browser.
Frequently asked questions
What file format do I bring into Rosebud? Export a .glb collider mesh from Marble and upload it in the Assets tab.
Do I need to code? No — Rosie handles the gameplay logic from your natural-language prompts.
Can the world be multiplayer? Yes — via Rosebud's InstantDB multiplayer setup.
Ready to build? Start in Rosebud.
Andi Bucescu
Andi is the Head of Marketing at Rosebud, where she writes about the intersection of AI, creativity, and brand storytelling. She explores how generative AI is reshaping marketing strategies and creative workflows, with a focus on making complex technology accessible and cutting through the noise of modern campaigns. Her perspective is informed by undergraduate research on effective social media content and consumer psychology.