Meet & befriend
Get close to a cat and spend some time together. Each friendship has up to five hearts. Slow down around nervous cats; a frightened cat may scratch.
Huntrezz Janos · 2026 · on VIVERSE
CLOWDER — A Cat Collecting Game
Pet or feed cats to build your clowder, who follow you around with varying dedication.
Web game · desktop, mobile & WebXR
clowder /ˈklaʊdər/ · noun
a group of cats
01 / The game
Build your clowder
A cat collecting game set in a pastel city floating among clouds.
Explore on foot, meet named cats, and build friendship through petting, treats and time together. As your bonds grow, cats follow you farther through the city. Your clowder becomes a moving trail of companions.
Grow your following
More affection means cats stay closer and follow farther. Friendship fades over time, but a cat that has reached five hearts keeps at least one heart with you.
Spend heart points
Building affection also earns heart points. Use them to unlock doors and buy things for your cats. The points in your wallet are separate from a cat’s friendship.
Some of the cats you’ll meet
100 named cats
Plus special cats to discover inside the city’s rooms.
“Can you collect all 100?” — from the original CLOWDER proposal
02 / The world
Cat City of Clouds
Explore the map ↗Doors & rooms
Unlock pastel doors with heart points. Inside: furnished rooms, wall art and special cats. Friends can follow you in, and you can ask individual cats to stay.
The cloud shop
Visit the Cloud Persona shopkeeper for treats, tuna, catnip, toys and furniture. Take things out of your bag to toss or place them in the world.
Carts & carrying
Earn the Cat Person badge by gathering four followers to unlock carrying. Pick up a cat, place them in a cart, and push your passengers through the city.
Below the streets
Gather twenty cats to earn Swarm Leader and unlock the sewer mouse hunt. Catch mice for your bag while your cats wait upstairs.
03 / Art & development
Making CLOWDER
From a proposal for a cloud-floating city to a playable web game.
The idea
A group of cats
The original 2026 VIVERSE proposal describes a kawaii, pastel urban world: rooftops, balconies, alleys and sky bridges, with cats accumulating into a living trail behind the player.
The central rule was already there: the more attention you give a cat, the closer it follows and the farther it will go. The finished game builds on that idea with hearts, rooms, items, badges and exploration.
The visual language
Pastel city, drawn edges
Pink, peach, mint, butter yellow and lilac run through the buildings, interiors and interface. Toon shading and visible outlines carry the illustrated look into the 3D world, alongside clouds, sparkles and graffiti.
The game combines a layered illustrated title screen, a headphone-wearing avatar, cat portraits and Cirrus’s pixel-art expressions. This page uses those original assets, plus the same Next Ups lettering and VT323 interface font.
The systems
Making the world playable
CLOWDER is built with TypeScript, Three.js and Vite. An SVG ground map defines the terrain; placement tools arrange props, cats and doors. Cat behavior brings together wandering, following, pathfinding, separation and affection.
Interiors combine seeded furniture and wall art, while local saves keep track of the player, cat bonds, unlocked doors and heart points. The web build includes keyboard and mouse, touch and WebXR input paths.
More development details
Petting combines a close-up camera, a crouching avatar and arm inverse kinematics. The camera uses mesh collision checks. Baked maps and cat portraits, optimized assets, deferred loading and freezing the outdoor scene while indoors help manage the rendering work.
CLOWDER · by Huntrezz Janos
Play on VIVERSE
Explore the city. Meet the cats. Build your clowder.
Play CLOWDER ↗Created by Huntrezz Janos with support from the VIVERSE creator grant.