Uther's Lab

Uther's Lab is the location Uther usually can be found in. He usually either comes up with evil plans or stands guard at the radar across from the entrance.

Chronicles of Uther series
Uther's Lab, although not named, first appeared in the first movie; It was Kirby Air Ride's City Trial underground area where the Air Ride Machines could be found in Free Run, unchanged. Uther sometimes stopped in the area that in the later series would become the lab to tell the viewers about his annoyance with Arthas.

This didn't change until the current "series" began, though Uther didn't do much complaining after the second movie.

World of Kirbycraft: The Series
Starting in the series, Uther's Lab got its name, though never directly referred to as such. It's never appeared in a 2D segment but since the 3D segments are Kirby Air Ride running using Dolphin, although the textures of Uther's Lab have changed, with yellow-green gradients on the walls and blue tiling floor, the location in City Trial (named Hell City in the series) is the same.

World of Kirbycraft (ZDoom)
In the ZDoom-based TC, Uther's Lab has been redesigned from a "garage" and various entrances below a city into a small building located in a grassy area; The inside is small with two doors, one that leads to the first level and one that leads to the training area. There's also a radar, which is important in Arthas' first level cutscene. The walls, ceiling, and floor are all shiny metal and there are lights embedded in the designs in the ceiling around the radar.