Tron City is the main city in the Tron system. It is built on the Grid, Kevin Flynn's master creation, and is the pinnacle of his "digital frontier". It is constructed in a hexagonal shape, with a deep chasm surrounding its perimeter. Bridges connect it to the surrounding area and form highly defensible choke points against any surface-based aggression. The city, like the Grid around it, matches the darkened environment of the rest of the Tron system. The gloom is offset by brilliant white illumination, meandering throughout the city like circuits on on a printed circuit board.