This game is not a puzzle but a collection of puzzles on beautiful photos, with options such as grid or the background image displayed.
The Options menu on the right will choose to display the grid or image in the background, but also select "Easy" for a visual aid. With the mouse, move the pieces to their alleged establishment. To rotate a piece, click on free movement thereof.
(Automatic translation)
A context menu should be shown when right-clicking or, on touch devices, long-pressing in the game. This menu especially allows to play in full screen and control the volume.