Prefab World Builder is a Unity editor tool designed to simplify level creation by allowing developers to quickly assemble worlds using prefabs. It features drag-and-drop placement, snapping, grid alignment, randomization, and modular building support. Perfect for creating landscapes, cityscapes, or complex environments, it works seamlessly with URP, HDRP, and Standard pipelines. Prefab World Builder speeds up scene construction, improves workflow efficiency, and provides a flexible, intuitive way to build detailed, polished Unity worlds without manual placement of individual assets.