Sit back and watch how peacefully these koi fish are swimming in Koi Fish Pond Idle Merge! Can you unlock all the different types of koi fish in this relaxing game?

Your objective in this game is to unlock all the koi fish and increase your level. When you start the game, you only have access to low-level koi fish. To unlock higher tiers, you should combine two of the same level fish. Place the fish you have on the track so they can swim around and generate coins. When you have a pair of the same level fish, you can merge them to create a higher tier one. High-level fish swim faster and generate more money. You can buy more fish and upgrade your tank with the money you earn. You can add more slots to house fish, increase swimming speed, boost your income, and even earn discounts. Merging fish will increase your level as well. It is best to keep your tank filled with the highest-tier fish available to you to max out your profits. Can you unlock all the koi fish types?

Idle Merge Car and Race is another popular game we have on our website that has a gameplay similar to this one. Have you checked it yet? Enjoy!

Developer developed Koi Fish Pond Idle Merge.

Release Date

May 20, 2024


  • Colorful 2D graphics
  • Intuitive controls
  • Entertaining gameplay
  • Different fish types to unlock
  • Different upgrades to purchase


Use your mouse to play.