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Rat Overflow

Rat Overflow is an adorable rat breeding simulator about genetics, glory, and having way too many rats. Develop your show winner bloodlines and breed thousands of unique rat coats!

All Reviews:

Positive (11) - 100% of the 11 user reviews for this game are positive.

Release Date:

Mar 12, 2026

Developer:

Little Beast Lab

Publisher:

Little Beast Lab

	Interface	Full Audio	Subtitles
English	✔

Early Access Game

Get instant access and start playing; get involved with this game as it develops.

Note: Games in Early Access are not complete and may or may not change further. If you are not excited to play this game in its current state, then you should wait to see if the game progresses further in development. Learn more

What the developers have to say:

Why Early Access?

“I wish to include the community in development! My core game loop is in place, but I wish to include player suggestions and feedback whenever possible.”

Approximately how long will this game be in Early Access?

“2-4 months.”

How is the full version planned to differ from the Early Access version?

“I plan to add more color genetics, rat life stages, NPC interactions, and gameplay features around the current core gameplay.”

What is the current state of the Early Access version?

“All features in the 'About this game' section are already implemented.”

Will the game be priced differently during and after Early Access?

“Price may be raised slightly at full release.”

How are you planning on involving the Community in your development process?

“My core game loop is in place. I plan to use the Early Access period to gather community feedback, and hope to let players influence how gameplay is balanced and how common or rare specific coats are. Future development directions will be shaped by player suggestions where possible.

The best way to be in touch is the Little Beast Lab Discord server.”

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$5.99

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About This Game

Rat Overflow is a deceptively cute rat breeding simulator about genetics, glory, and having way too many rats.

Breed fancy rats with a realistic color genetics system, show them off in competitions, and try to keep track of your ever-growing colony. Pick your pairings carefully — or don't — and watch the pups grow into champions, beloved pets, or delightful genetic surprises. With thousands of possible rat appearances driven by real inheritance mechanics.

Start with humble stock, outcross from five quirky NPC breeders — each with their own color specialties and personalities — and build bloodlines that dominate the show circuit. But be warned: Rats breed fast. More pups are on the way. They're always on the way.

SHOW THEM OFF

Enter your best rats in shows against rival breeders, win championships, and level up to unlock new breeders with new color varieties and better genetics.

REAL GENETICS, REAL CONSEQUENCES

Over a dozen genetic loci control color, markings, health, and conformation. Siamese, Russian Blue, Dumbo ears, Rex coats — it's all in the genes. Breed strategically, or discover what happens when you don't.

DRESS TO IMPRESS

Buy outfits and accessories to style your rats for photo ops. Express yourself. They're your rats now.

FEATURES

Realistic genetics with 14+ loci and thousands of color/pattern combinations
5 NPC breeders to unlock, each with distinct specialties
Multi-tier show system with rival competitors
Health and conformation genetics — longevity and show success are inherited
Pastel retro aesthetic with pixel art and a Windows 98-inspired UI
A gentle but persistent sense that you have too many rats

About AI use in game development

The game's code is written with significant help from AI.

Some text in game, as well as text on the store page is written with AI assistance.

All graphics in the game are and always will be painted and edited by me without any use of generative AI. Same goes for the store page and all other marketing.