Koi

A puzzle adventure about guiding fish to restore polluted waters

Dotoyou Games · Released Feb 22, 2019

Reviews: Very Positive; 86% of 127
Recent reviews: Not enough recent
Players: 0; daily peak, Oct 29, 2026
Steam Deck: Untested
Last update on Steam: 4 years ago; Jul 27, 2022
Minimum PC: 128mb Memory; 2 GB RAM · 2 GB disk; Full requirements

What is Koi?

You control a koi separated from its owner in this single-player casual adventure. Across eight stages, you navigate underwater obstacles, guide other koi to open flowers, and solve musical memory puzzles to help restore the ecosystem.

For you if...

+you enjoy relaxed exploration with simple puzzles
+you like searching for collectibles off the main path

Not for you if...

−you want a lengthy campaign with a detailed story

What players say

86% of 127 reviews are positive

Players praise the soundtrack and straightforward controls. Some criticize repetitive tasks and large, empty levels, while recent reviewers also report loud sound effects and a lack of music and effects volume settings.

Screenshots and trailer

Koi system requirements

Minimum: 128mb Memory, 2 GB RAM, 2 GB of disk space.

As published by the developer.

Can my PC run Koi?

Tell us your graphics card once and every game page will answer this for you.

Set up my PC →

Minimum

OS: Window 7 sp1
Processor: 2.0 Ghz
Graphics: 128mb Video Memory, capable of Shader Model 2.0+
Memory: 2 GB RAM
Storage: 2 GB available space
DirectX: Version 9.0c

Does Koi have co-op or multiplayer?

No: single-player only, no multiplayer modes declared.

Single-player

Does Koi run on Steam Deck?

Untested Not yet tested by Valve on Steam Deck.

PC version details

DRM: None declared on Steam
Controller: Full controller support
Platforms: Windows
Achievements: 19
Steam features: Cloud saves, Family Sharing
Languages: Text only: English, Japanese, Simplified Chinese, Traditional Chinese, Korean.

Does Koi use AI-generated content?

No AI-generated content is disclosed on the game's Steam page.

Self-reported by the developer under Steam rules: it covers AI content that ships in the game, not tools used to make it. Steam page checked on Oct 27, 2026. How to filter AI games on Steam