Point and click to explore the room, find hidden items and
You can change viewpoint with clicking the triangle button that appear on the room.
The items which you found are added to item list, you can use them by clicking.
The item detail window appear by clicking loupe mark (appear on the item list), you can check the item closely and operate it.
In the detail window, you can use other item on the item.
You can save your progress by using the lower right "SAVE" button.