Koi Fish Pond Home Koi Fish Pond 0.0 / 5 ( 0 votes ) Your Rating? Discover Koi Fish Pond – Play Free Now on GameHard! Koi Fish Pond is a super idle simulator game where you need to build your own Koi fish company and grow your business. Release your Koi fish into the pond and earn money every time they cross the finish line. Buy new upgrades and become a businessman. Play now at RegionGame and have fun. Categories in which Koi Fish Pond is included: Puzzle Penguin Animals