The Code is a BBC documentary about Professor Marcus du Sautoy's search of a mysterious code that governs our world through numbers, shapes and patterns. It's also a next-generation transmedia treasure hunt aimed at all ages and abilities that takes place online through games, puzzles, Facebook and Twitter, in the real world, and in Lost-style clues hidden within the TV show itself.

The Code is one of the most ambitious 'native transmedia' projects ever created by the BBC and Six to Start, and it demonstrates what's possible when a broadcaster with the reach, reputation, and quality of the BBC meets the breadth and depth of engagement that the web can provide.

In this session, we talk about the challenging journey of The Code from its inception, through design, production and delivery, we explore the best practices for making similar projects, and we reveal audience figures and engagement numbers from the experience.