Marble is opening a new beta for kids aged 6 to 12, a learning world played as a game and now on the App Store for iPad, Mac, and iPhone. Children explore one island, where they craft tools, draw, collect finds, and talk with characters who answer back, each with a personality and a specialty such as building, plants, or art. The company said 15,000 families were on the waitlist when this beta opened. Nothing in a session is scripted. A child might sketch a lantern, fail at the first build, and try a different approach until it works, or scan a fossil into a local codex. Quests then follow that interest and sit just past what the child already knows, drawing on the UK National Curriculum and US science and social-emotional learning frameworks, with the weight on science, design, and making. After play, parents get a short note on what was made and what to ask about later. There is no feed and no advertising. The main model is Claude Haiku, with separate systems for speech, character voices, drawing, and image screening, and only a parent can create a child's account. Lionel Mora, who previously founded Neoplants and worked on the Google Assistant launch in Europe, is building Marble with Guillaume, a former Google Search product manager and early product lead at Synthesia. The same team has published an open map of primary-school concepts across US, UK, and Australian curricula, plus a tool that turns a child's age and interests into a playable experiment.