Issue 116 of European games development magazine Develop, published for May 2011. www.develop-online.net. Develop is the leading industry publication for game design, coding, art, audio and business. The lead feature in this issue offers an in depth look at the culture of Portal studio Valve, in which we talk to the senior staff responsible for one the year's most critically acclaimed games. Other key features include an in-depth analysis of the world of game audio with contributions from a wealth of industry experts, a run down of the Develop Award nominees, and a look at Lionhead's creative process. Additionally, Havok's mobile tech goes under the microscope, while Ignition Entertainment explains how it harnessed NaturalMotion technology for its game El Shaddai. There's also all the latest news, tools, tech and service news, and opinion from industry leaders.