From Shoot Em Up Kit
The Tools menu is used to place objects in a level. It also allows the user to modify Level Settings , select an item in the level, and display or resize the grid.
The buttons in the Tools menu are as follows:
Display Grid Lines
Set Grid Size
Current Layer - Items can be placed at different depths within the scene. Layers make it easier to place items in the foreground or background. The higher the layer number the deeper into the scene the items will be placed.
Distance between each layer
Snap To Grid
Snap To Object
Snap Rotation to 45 degrees
Level Complete - Return to Level Menu