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!

<p class="bb_paragraph" ><strong>Rat Overflow</strong> is a deceptively cute rat breeding simulator about genetics, glory, and having way too many rats.</p><p class="bb_paragraph" >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 <strong>over 8,000 unique rat appearances driven by real inheritance mechanics</strong>, every litter is a little moment of discovery.</p><p class="bb_paragraph" >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.</p><h2 class="bb_tag" >SHOW THEM OFF</h2><p class="bb_paragraph" >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.</p><h2 class="bb_tag" >REAL GENETICS, REAL CONSEQUENCES</h2><p class="bb_paragraph" >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.</p><h2 class="bb_tag" >DRESS TO IMPRESS</h2><p class="bb_paragraph" >Buy outfits and accessories to style your rats for photo ops. Express yourself. They're your rats now.</p><h2 class="bb_tag" >FEATURES</h2><ul class="bb_ul"><li><p class="bb_paragraph" >Realistic genetics with 14+ loci and thousands of color/pattern combinations</p></li><li><p class="bb_paragraph" >8,000+ unique rat appearances from pixel art layers</p></li><li><p class="bb_paragraph" >5 NPC breeders to unlock, each with distinct specialties</p></li><li><p class="bb_paragraph" >Multi-tier show system with rival competitors</p></li><li><p class="bb_paragraph" >Health and conformation genetics — longevity and show success are inherited</p></li><li><p class="bb_paragraph" >Pastel retro aesthetic with pixel art and a Windows 98-inspired UI</p></li><li><p class="bb_paragraph" >A gentle but persistent sense that you have too many rats</p></li></ul>

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