Labrat 1 is the third tileset used in the official levels and a hard one to use. It is probably inspired to a good extent by Earthworm Jim.
The tileset takes place in Devan’s labs. It consists of things like computers, tubes, chemicals etc. It has a weird ground with is made of what? I do not know. The tileset is used moderately and is one of the few to have belts.
Eat your lima beans, Johnny.