Game Design

I Have No Words & I Must Design
By Greg Costikyan
http://www.costik.com/nowords2002.pdf

The Art of Computer Game Design
By Chris Crawford
https://directory.vancouver.wsu.edu/sites/directory.vancouver.wsu.edu/fi...

Playing Fair: A Look at Competition in Gaming
By Mark Newheiser
http://www.strangehorizons.com/2009/20090309/newheiser-a.shtml