There are four bright and picturesque levels: office-room, jewellery shop, workshop and grocer's. You have a list of hidden object that should be found. Click at the object with mouse and it will disappear. Find all objects to escape the room. There is Hint bonus in case you failed to find the object. Just click at Hint and at the object that should be found.
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.