This volume gathers the lecture notes of the Second International Summer School on Cognitive Wireless Communications "Highlight on Game Theory", held in Paris, France, on July 10-13, 2012. The school was initiated by the European ACTION IC0902 funded by COST (European Cooperation in Science and Technology, www.cost.eu) in the domain of InformationTechnologies(ICT) and organized by Supélec laboratories, research groups and Game Theory, which has been applied at the beginning in economics and related domains, is gaining much interest today as a powerful tool to analyze and design communication networks. More specifically, it is particularly suited to the context of cognitive radio, where complex cognitive radio terminals could generate an overall chaotic behavior of the whole network without the appropriate analysis that can be brought by Game Theory. The objectives of this 4-days Summer School were to give to the participants a solid knowledge of the theoretic foundations of game theory, and to provide a deep insight to applications with specific case studies in the context of wireless networks and cognitive radio. The book is arranged following the training school program over the four days, presenting for each class a short abstract followed by the handouts presented by the lecturers.