Each rat has a gene code that determines what they look like and what their offspring can potentially look like. The gene code will be hidden unless you use a Lab Test to reveal it. An example of a gene code is: AAMmrrPpCcGGHHDdxx

Agouti Locus:
AA or Aa = Agouti
aa = Solid (Black)

Mink Locus:
MM or Mm = no effect
mm = mink dilution

Ruby-eyed Locus:
RR or Rr = no effect
rr = ruby-eyed dilution

Pink-eyed Locus:
PP or Pp = no effect
pp = pink-eyed dilution

Color Locus:
CC or Cc = no effect
cc = albinism

Grey (Blue) Locus:
GG or Gg = no effect
gg = grey dilution

Hooded Locus:
(Simplified)
HH = self
Hh = berkshire
hh = hooded

Dumbo Locus:
DD or Dd = normal ears
dd = dumbo ears

Rex Locus:
XX = double rex (patchwork hairless)
Xx = rex (curly)
xx = standard coat

I’ve tried to have the breeding on here mirror real life as closely as possible. You don’t need to bother learning what these genetics mean unless you’re attempting to breed for a specific coat.

Once you have one rat of each sex, you can breed them. The female rat will be pregnant until some time after the next rollover and will give birth to 6-9 pups. The pups will have randomized genetics based on the gene code of their parents. Each pup will be born with its own gene code, but the code will be hidden unless revealed with a lab test.

These rats have a lifespan of 11 days. Rats purchased from the gacha will start at age 5. Rats will age up every day unless the thread is temporarily closed.


(Day 1, litter of 9)
When a rat is born, it is part of a litter. The newborn rats, or “pinkies” will all look the same. At this stage, you will learn the pups' ID #'s and genders.


(Day 2)
As the pinkies get older, they start to grow fur, and their colors begin to show. At this stage, you will learn the pups' coat color.


(Day 3-4)
When the pups get older, you can start to see what they will look like as adults. At this point, they’re separated and are treated as individual rats rather than as a litter. At this stage, you will find out the rats' coat and ear types. They can also be surrendered to the adoption center or auctioned off at this age.


(Day 5)
When the rats fully mature, they are ready to breed. At day 5, the female goes into heat and can be bred immediately. The male can breed to any female once a day.

A rat will be pregnant for one day. It will give birth some time after the rollover. It will need one day to nurse its pups and one day to rest, then it will go into heat again. The rat will stay “in heat” until it is bred. The rat’s lifespan is 11 days, meaning a female rat has the potential to produce 2 litters in its lifetime.

Each rat will be given a number ID Code for the sake of keeping things organized. I will have a master list of all rats in game, along with their genetic codes and ages.
Example code: #021

Unwanted rats can be surrendered to the Adoption Center starting from the moment they are separated from their litters (Day 3). The owner will get 50sb per rat they surrender. The rats will remain here for 48 hours, where other people can purchase them for a set price (250sb for regular and dumbo, 300sb for rex and dumbo rex, 400sb for double rex and dumbo double rex) If you think your rat is worth more than that, you can opt to auction it instead. (See below for auction rules). The rat's age will be frozen until it is purchased. The previous owner will receive 80% of the payment if the rat is adopted. The other 20% goes to the adoption center. If the rat isn’t adopted within 48 hours, it will disappear.

You can put your rats up for auction starting at age 3 if you believe other players are willing to pay good money for it. It will cost 100sb to enter your rat for auction. Just fill out the Auction Form and post it in the thread. You get to choose the auto buy, starting bid, and minimum increase, as well as how long you want the auction to run (cannot be more than 5 days). The rat's age will be frozen until it is won. The seller will get 100% of the payment. If the rat gets 0 bids by the time the auction is over, it will be returned to its owner. The owner will NOT be refunded the 100sb they spent to enter the rat.

Unwanted rats between the ages of 1 and 2 can be sold to a Reptile Rescue as feeder rats. You will get 50sb per pup. The rats will be removed from the game.