Illusion of Space

http://wow-screenshots.net/screenshots/view/horde-boats-in-front-of-northwatch-hold.html

This image is an example of a three point perspective because of all the multiple vanishing points used and parallel lines.

http://mmohuts.com/free-trials/world-of-warcraft

This is a two point perspective. A two point perspective is an image that disappears into two vanishing points of a horizontal lines. 

http://space.angrybirds.com/launch/

This image is an example of overlapping to show depth with little detail at all.

http://www.gamezone.com/products/call-of-duty-black-ops-2/originals/hardcore-kill-confirmed-is-in-black-ops-2-but-what-s-next

This image is a example of linear perspective because of the lines that move toward a single vanishing point if the buildings were not in the backdrop.