The game rules are pretty simple.
The first die must be placed to any of the border tiles. Another dice must be placed nearby.
Each round you can choose and place two dice of three. The remaining one will be moved to discard.
You can't place dice with the same color or value near each other vertically or horizontally, but you can diagonally.
Also some of the tiles could contain a required color or value. To bypass this rule you can use an instrument which you can choose of three available ones. Each game these instruments are different.
To earn points and stars you should fulfill the three goals, which are different from game to game.
You can see the score of each of your games at the score list which is accessed from the main screen.

Graphics of the game is taken from these sources:
Cartoon Texture Stone Vectors by Vecteezy
Image by upklyak on Freepik
Image by upklyak on Freepik
Image by upklyak on Freepik