UCG is a procedural city generation system built with Geometry Nodes that allows users to create custom urban environments using grid layouts or simple mesh editing. The generator handles the creation of intersecting road networks, complete with a smart traffic system that follows defined rules. Beyond basic city blocks, the system generates procedural parking areas, fences, electric lines, parks, and detailed sidewalks. It features randomized building types and shapes, and includes the Rk Building Generator alongside 17 shop front models for facade detailing. The package also provides lighting setups, vegetation, and road props to populate the generated scenes.