Get it and put it on top of the other paper with the peculiar design. Now you have the map to the hedge maze. Somewhere in the house you'll find a match. Open the compartment and get the mask. Do not push red button.
Black button kills tanks and white button destroys planes.
Next you'll encounter the rocket. After the truck launches the rocket, push green button then push black button. Move east again. Blue I think will get the diamond from the monument. Now after getting the diamond, keep moving east until the Chihuahua hits the eastern part of the dome.