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idle koi!
Hatch koi eggs, breed unique bloodlines, evolve rare traits, and send 3-koi teams into idle battles. Build a living collection where genes, rarity, lineage, and battle growth decide every koi's value.

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Features
Languages:
Interface Full Audio Subtitles
English ✔ ✔
French ✔ ✔
Italian ✔ ✔
German ✔ ✔
Spanish - Spain ✔ ✔
Russian ✔ ✔
Japanese ✔ ✔
Simplified Chinese ✔ ✔
Traditional Chinese ✔ ✔
Vietnamese ✔ ✔
Arabic ✔ ✔
Korean ✔ ✔
Indonesian ✔ ✔
Portuguese - Portugal ✔ ✔
See all 14 supported languages
Content
Includes Interactive Elements

In-game purchases, Chance based in-game purchases

This game is not yet available on Steam

Planned Release Date: July 2026

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About This Game

About this game:

idle koi! is a server-driven idle pet collection game about hatching, breeding, training, and battling magical koi. Every koi begins from an egg and grows through its own genes, appearance parts, rarity, skills, lineage, and battle history. Breed different bloodlines for a chance at mutation and leap evolution, then form 3-koi teams and send them on expeditions that keep fighting even while you manage other teams.

Key features:

- Hatch starter, bred, event, and limited genesis eggs.

- Breed koi with inherited body parts, fins, decorations, expressions, colors, and hidden genes.

- Chase rare leap evolutions that improve growth, power, and long-term value.

- Build up to five 3-koi battle teams for idle expeditions and replayable battle history.

- Trade and manage valuable koi through server-authoritative ownership, with Steam Inventory support planned for the Steam economy.

System Requirements

    Minimum:
    • OS: win10
    • Processor: Intel Core-i3 or faster processor
    • Memory: 8 GB RAM
    • Graphics: Graphics card NVIDIA GTX 1060 or higher
    • DirectX: Version 10
    • Network: Broadband Internet connection
    • Storage: 10 GB available space
    • Sound Card: soundblaster
    Recommended:
    • OS: win10
    • Processor: Intel Core-i5 or faster processor
    • Memory: 16 GB RAM
    • Graphics: Graphics card NVIDIA GTX 1060 or higher
    • DirectX: Version 12
    • Network: Broadband Internet connection
    • Storage: 20 GB available space
    • Sound Card: soundblaster
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