Spatial abilities are the perceptual and cognitive abilities that enable a person to deal with spatial relations, in other words the visualization and orientation of objects in space. Put simply spatial skills assess your ability to manipulate 3D objects by flipping and rotating them.
Spatial intelligence questions test raw intelligence without the influence of prior knowledge and as such performance on this scale is indicative of general intelligence. At a first glance, such questions may appear daunting but the trick is not to give up too quickly. Often a second look at the problem will reveal a different approach, and a solution will appear because the brain has been given the opportunity to process information further.