Designing Games with Game Maker - YoYo Games

To add instances to the room, first select the objects tab if this one is not already visible.
Next select the object you want to add by clicking on the button with the menu icon (or by
clicking in the image area at the left). The image of the object appears at the left. (Note that
when you changed the origin of the sprite there is a cross in the image. This indicates how the
instances will be aligned with the grid.) Now click with your left mouse button in the room area
at the right. An instance of the object appears. It will snap to the indicated grid. If you hold
the key while placing the instance it is not aligned to the grid. If you hold down the
mouse button while dragging it over the room, you move the instance to the correct place. If
you hold the key while pressing and moving the mouse multiple instances are added.
With the right mouse button you can remove instances. In this way you define the contents of
the room.
As you will notice, if you place an instance on top of another one, the original instance
disappears. Normally this is what you want, but not always. This can be avoided by
unchecking the box labeled Delete underlying at the left.
If you want to change the position of an instance, hold the key and click with the left
mouse button on the instance and hold down the button. You can now drag it to a new
position. (Use for precise positioning.)
If you hold the key while clicking with the right mouse button on an instance, a menu
appears. Here you can delete the object, type in a precise position for the instance, or move