Wood Column Color Ball Puzzle

A common color ball sorting puzzle game. You clear the stage by sorting balls of the same color into the same test tube. There are many levels with gradually increasing difficulty, perfect for relaxing and exercising your brain. There's a hidden mission. I only managed to complete it up to level 5, and there should be more. However, the mission time is very short, so if you want to complete it, you'll need to hurry.