Radioactive Blue
Radioactive Blue cheese (often referred to simply as RB) is a special type of cheese that cannot be purchased but instead must be created by using a Radioactive Blue Cheese Curd Potion, Corrupted Radioactive Blue Cheese Curd Potion or Greater Radioactive Blue Cheese Curd Potion (which are dropped by mice in the Lab, Mousoleum, and Catacombs) on SUPER|brie+ (for free, or a small cost with the corrupted potions) or Brie (for a small cost). Occasionally Radioactive Blue can be obtained as loot from Lycan mice.
It is used primarily in the Mousoleum and the Catacombs as the mice it normally attracts are mostly found in those locations.
In-game description
An accidental by-product of an experimental drug, this cheese was created during a chemical spill of a volatile potion. Native to the Laboratory, the experimental mice have found this new type of cheese extremely appealing. Eating it may or may not give you super powers. Use at your own risk.