About This Demo

Mio Aquaria is a cozy sandbox aquarium management game set in a whimsical world of water.
Build your aquarium from nothing, care for fantasy aquatic creatures from across the world, and lead a team of cat staff as you rise through the ranks to become the world’s greatest aquarium.

Core Challenge

Design freely, explore the depths, and solve the core challenge of Mio Aquaria:
balancing the needs of aquatic creatures and cats to create a thriving, attractive aquarium.

🐠 Build and Customize Your Aquarium

Create your aquarium your way using sandbox-style construction.
Build spaces, place facilities, and design tanks that balance water quality, temperature, and creature compatibility.

Hosting a diverse mix of aquatic creatures increases your aquarium’s attractiveness — but only if their needs are met.

🌊 Discover Fantasy Aquatic Creatures

Explore the world to discover new resources, materials, and new inhabitants for your tanks.
The creatures of Mio Aquaria are inspired by real aquatic life, but reimagined as fantasy beings with unique traits and requirements.

Some aquatic creatures can only be unlocked through exploration or research.

🐱 Manage Cats, Not Just Buildings

Your aquarium is run entirely by cats — staff and visitors alike.

• Staff cats need fair pay and comfortable working conditions

• Visitor cats come to see their favorite creatures, but also expect food, drinks, rest, leisure, and shopping

• Ignore their needs, and strikes or reputation loss may follow

Keeping cats happy is just as important as keeping aquatic creatures healthy.

🔬 Research, Progress, and Optimize

Research new policies and perks to improve your aquarium’s efficiency and appeal.

• Unlock new aquatic creatures and gameplay mechanics

• Increase visitor capacity, tips, and inventory space

• Improve staff effectiveness and aquarium operations

Multiple resources shape your strategy, including Coins, Materials, Research Points, and Hearts earned by satisfying visitors.

🏆 Compete for Reputation

Take part in regular aquarium contests and compete against rival aquariums.
Earn reputation, climb the global rankings, and challenge the industry giant Star V. Co.

To truly complete your journey, you’ll need to discover and host a legendary creature — the ultimate test of your aquarium mastery.

🎮 Demo Version

The demo lets you experience the opening chapter of Mio Aquaria and get a feel for its core systems and charm.

• Progress up to Reputation Level 5, covering Chapter 1 of the story

• Explore early gameplay systems, aquatic creatures, and aquarium management

• Save data may carry over to the full game, but compatibility is not guaranteed as systems and content may change during development

• Weather conditions are disabled

The demo represents only a portion of the full experience, with many creatures, facilities, mechanics, and story content awaiting in the complete game.

AI Generated Content Disclosure

The developers describe how their game uses AI Generated Content like this:

AI is used only during the early concept and ideation stages of some art. All final in-game assets are created and implemented by the development team.