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.

DeveloperAnn Games
PublisherAnn Games
Released30 Sep 2026 (upcoming)
PriceFree to play
Reviews–
CasualStrategyTurn-Based Strategy2DPvPTurn-Based CombatSingleplayerFree to PlayIndieMultiplayerTradingIdler
Followers
–
Steam community
Where it ranks on Steam
| Popular upcoming | #395 |
Members see more
Sign inThe full estimate range for idle koi! (copies sold and revenue, with how it's calculated), player and follower history, price history and review trends.