Jay Stelly is a senior engineer at Valve, and on the last day of the conference he kicked off the morning with a discussion on Physics in Half-Life 2 (HL2). The physics simulation, and inventive physics-related puzzles used throughout the game, were complicated elements to implement. He discusses the problems they faced, relates some of the humorous demos they used to flesh out their ideas, and laid out the ways that good engineering can make design that much better.

conq writes "BusinessWeek has a feature on the videogames design students were able to create in 24 hours. From conception to completion. The games are quite basic but it is fascinating what they are able to come up with in so little time. From the article: 'The teams' challenge was to collectively create a mobile-game masterpiece using a "mystery ingredient" -- random verbs and nouns -- to guide design.'"