Game designers spend their lives solving extraordinary problems and facing mind-bending paradoxes. It's their job to make a meticulous plan for "spontaneous fun" players will want to experience over and over again. Pressure is heaped on with demands for innovation and blockbuster status. So designers find themselves facing an abyss of problems, pressure, and possibilities, armed only with their brains and an assortment of design principles they picked up over years of experience.