After teaching game theory (at both the undergraduate and graduate level) at the University of California, Davis for 25 years, the author decided to organize all his teaching material in a textbook. There are many excellent textbooks in game theory and there is hardly any need for a new one. However, there are two distinguishing features of this textbook: (1) it is open access and thus free, and (2) it contains an unusually large number of exercises (a total of 165) with complete and detailed answers.

The author tried to write the book in such a way that it would be accessible to anybody with minimum knowledge of mathematics (high-school level algebra and some elementary notions of probability) and no prior knowledge of game theory. However, the book is intended to be rigorous and it includes several proofs. The author believes it is appropriate for an advanced undergraduate class in game theory and also for a first-year graduate-level class.