The Mouse is a critter and cannot harm players. However, unlike most critters, they cannot be harmed by monsters. Mice have only 5 health. They spawn in Underground and Cavern layers. Their small size and speed can make them difficult to spot even in well-lit conditions, although they occasionally squeak. Unlike most other critters, NPCs will prevent mice from spawning.
- 老鼠的 怪物圖鑑條目：「Mice squeak around harmlessly, looking for small insects in damp underground locations.」
- 電腦版 1.3.1：現在可用於製作老鼠雕像。
- 電腦版 18.104.22.168：引入。