Single-player games like Rat Overflow
Below are 8 single-player Steam games similar to Rat Overflow, ranked by player overlap. Every pick carries Steam's Single-player category, so multiplayer-only titles or always-online games don't sneak in. imho.run pulls the category data from Steam directly — Single-player here matches what the store labels.
Want the full alternatives list (paid + free + Steam Deck + cheaper picks)? See the parent games like Rat Overflow page.
Ranked picks
- 1
Tank of the Fittest
Single-player alternative to Rat Overflow — playable solo, no multiplayer required. Shares Simulation and Casual with Rat Overflow.
Tank of the Fittest is a dark aquarium roguelite. Twist heat, pH, oxygen, and pollution to cull the weak, trigger new traits and evolutions, set off chains of devouring, and forge one apex specimen powerful enough to turn the tank against itself.
- 2
ChillTank
Single-player alternative to Rat Overflow — playable solo, no multiplayer required. Shares Simulation and Casual with Rat Overflow.
Build your own little underwater escape. Collect colorful fish, raise new generations, and decorate three cozy 2.5D habitats. Feed, grow, breed, or simply enjoy the view — a relaxing singleplayer aquarium, playable offline.
- 3
Gridworld
Single-player alternative to Rat Overflow — playable solo, no multiplayer required. Shares Simulation with Rat Overflow.
Gridworld is an artificial life and evolution simulator. Watch creatures evolve through natural selection as they learn to find food, avoid danger, and compete with other creatures for survival.
- 4
Ant Keeping Simulator
Single-player alternative to Rat Overflow — playable solo, no multiplayer required. Shares Simulation and Casual with Rat Overflow.
Grow, feed and care for your colony of mighty ants in a realistic semi-idle simulation of ant keeping. Created in collaboration with ant keeping enthusiasts, Ant Keeping Simulator will be an accurate experience to ant keepers.
- 5
Biotope
Single-player alternative to Rat Overflow — playable solo, no multiplayer required. Shares Simulation and Casual with Rat Overflow.
Biotope will be the most detailed and realistic aquarium simulator on the market. Biotope makes it possible to create complex aquarist ecosystems and simulate realistic life cycles of plants and fish.
- 6
GeckoShop
Single-player alternative to Rat Overflow — playable solo, no multiplayer required. Shares Simulation and Casual with Rat Overflow.
Collect and sell geckos. Manage and upgrade your shop. Explore the island, filled with life and secrets. Sell your geckos, or keep 'em as your Pets!
- 7
Lakeside Bar
Single-player alternative to Rat Overflow — playable solo, no multiplayer required. Shares Simulation and Casual with Rat Overflow.
A cozy management sim where the jazz is smooth, the cocktails are cooler than the evening breeze, and the lake reflects your perfect escape.
- 8
Monster Lab Simulator
Single-player alternative to Rat Overflow — playable solo, no multiplayer required. Shares Simulation and Casual with Rat Overflow.
Ready to become a mad scientist? Synthesize, evolve, and command an army of unique creatures in your own lab. Manage your laboratory, master genetic essences, and dominate the battle arena in this deep creature collection simulator!