How generative systems are reshaping the way games are made, how we experience them, and what this reveals about creativity itself. In video games creativity isn't just seen – it's played – from exploring endless landscapes, to diving into character details, to immersing ourselves in unpredictable narratives. Yet these elements are often the result of procedural generation – the creative use of algorithms to design game content. Procedural generation is the secret behind some of the biggest hits in video game history, from genre-defying titles in the 1980s, to the most famous blockbusters of today. Next Level demystifies the collection of algorithms and procedural techniques that are often as mysterious as the things they create. Written by game designer and creative AI researcher Mike Cook, it takes us on a tour of generative systems past and present, exploring how they work, the artistic uses they have in some of our favourite games and how procedural generation didn't just change how we design games, but how we think about creativity.