Toggle, Drag and Snap, and Drag Mask
How the completed file works:
File #1: Toggle a flashlight on and off
Click on the flashlight. If it is already on, then turn off the light. Otherwise, turn the light on.
File #2: Drag and snap to a grid
Click and drag the battleship. Upon mouse up, it snaps to the closest grid point.
File #3: Drag mask
Click and drag the x-ray mask.