Game Design Grand Theft Bicycle is a game-art installation that uses the kinetic interface of a bike – modified with sensors – to allow users to ride through a 3D “mod” of a video game (Grand Theft Auto: San Andreas) set in a desert environment. Physical Computing A particular research concern addressed in GTB is the generally sedentary nature of gaming culture. This has changed somewhat in recent years with the advent of the Wii, but in general most game culture remains profoundly “unphysical.” To play GTB you need to ride our sensor-modified bike. Inaction will produce very few results. What is interesting to observe is that people of all sizes and shapes will play the game for extended periods when as a rule it would be extremely unlikely for most of the gaming public to get on an exercise bike for similar periods of time. To get to this level of engaged user-interaction it was important for us that the interface be as transparent and intuitive as possible. In essence the project functions as a model for physical interfaces in which the user is made unaware of his or her physical activity via intense engagement with the literal interface and the compelling content.