The scurry is a large, mutant rat. The scurry is afraid of just about everything, and when something moves next to a scurry it will run in the opposite direction, even across powered floors. They will be blocked by switches, walls, workbenches and pits though, and cannot go through electrical fences. Scurries can run under lattices and over hurdles, and may change door directions. If a scurry steps on a touchplate, the corresponding t-door is lowered. The scurry can only pass through lowered t-doors.

Scurries are scared of pushers and conveyors but can be teleported, and if they enter a gear they will keep running after being rotated. When a vine is complete on a square the scurry will flee (it does not flee when the vine first enters the square).

Scurries are more hungry than they are afraid, so a running scurry will stop to eat cheese.