
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!
Modeled estimate, not a reported figure. How we estimate →
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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.
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.
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.
Buy outfits and accessories to style your rats for photo ops. Express yourself. They're your rats now.
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
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 all graphics on the store page and other marketing.
Genres
Stats
All-time low is the lowest price we've recorded for this game since we started tracking it.
Languages: English
Engagement
Hours played at review time, across 40 reviews with recorded playtime.
Reviews
Themes across 40 recent reviews and how positive each mention is. A keyword signal, not full sentiment analysis.
positive critical· bar length = how often the theme comes up
Reviews
I like rats
Genuinely a delightful little game that I can see myself spending hours on without realizing how much time has passed. The price tag is just right for what the game has to offer currently. Gameplay is a little repetitive in the way I, personally, enjoy very much for this kind of game. There's plenty to learn, but much of it is intuitive enough that I don't need to have my hand held for every little decision One critique: - Keeping track of which rat is which is a little difficult, this could be improved if we could pause the game and access the rat's profiles to change names. Currently you can only access the wiki when the game is paused. Slow mode is helpful, but I still panic a bit to figure out who I need to sell/rename/etc.
This is SUCH A CUTE RAT BREEDING GAME!!! I absolutely adore genetics games, and I love that rat overflow allows you to have choice in the kind of rats you breed, while also having a paced out gameplay that keeps it interesting. I think the art style is adorable, and I am so happy I stumbled across this game by chance. It's genuinely such a cute and relaxing genetics game, I would recommend it to everyone who enjoys these kinds of games!
Nice breeding simulator. Takes some getting use to and misses music / sound effects. To the developer: can you please also make this engine for Syrian hamsters?
Cute rat collector game. Look forward to achievements and ways to display my premium rats. lol
Phenomenal. This is the genetics game I've been searching for my entire life.
weirdly addictive and fun so far :)
Really loving this game! Cant wait to see whats added next! Id love too see maybe categries/Tabs so you can organise your rats! and maybe if the breeding section was a little cleaner! Amazing game <3
A lovely little game, especially for genetic enthusiasts out there. Beautiful touches like the pinkies (day 1-7) gradually developing dark pigment so you start to see their markings. Automatically adding in discovered genetic traits to parents based on their offspring and being able to add your own tags to filter rats is amazing. Others have said they find it limiting not being able to pause the game outwith the wiki. I would say the "epic" gameplay speed is very slow and gives you plenty of time. Some features that I hope may be added in the future would be the ability to compare rats' stats side-by-side, and perhaps some goals/achievements e.g. to produce a specific coat colour for a buyer. Overall I think the game is worth the price in its current form anyway, if you like breeding and genetics games I would recommend you pick it up!
The time and love that has went into this game is apparent and the designs are precious! It is a fun gameplay loop without being crazy hard in anyway. As someone who has played many hours on games like lioden and howrse this is right up my alley.
Related
Related
Trends
Concurrent players on Steam, sampled daily since tracking started.
Momentum
Pace estimated from the game's recent review growth (our daily snapshots) at its own sales-per-review ratio — a momentum signal, not booked sales.
Audience
Estimated from the language of this game's reviews — a proxy for where players are, not official Steam demographics.
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