When purchasing a new rat cage, it simply replaces your previous rat cage. Any rats you have will transfer over to the new cage. Cages have to be purchased in sequence. The Three-Slot Cage is only available for purchase while a player has Donator Status. If you lose donator status, the option to buy it will be gone. Once purchased, the Three-Slot Cage is yours even if you're no longer a donator.
* Only donators can purchase this rat cage.
Rat Roulette Wheel
The Rat Roulette Wheel is used for a random chance at obtaining one of the following rats. It can be used 3 times per day.