Sort the balls by color to win!
The bottles are filled with balls of different colors and you need to sort them by color. The challenge is that you can only stack balls of the same colors on top of each other.
Be careful: it is possible to get into a state where it is not possible to win anymore, so careful plan your next moves!
No need to overthink though, you can just play this relaxing game and always restart a level and take as much time to think as you wish!