General game playing (GGP) is a research field for improving the general gaming intelligence of machines. It is different from specific game playing in that GGP players do not know game rules before the game begins, which makes them independent from human experience on specific games. Until now, GGP researchers have deeply explored many problems, such as game representation, search algorithm, and state evaluation. Also, some efforts have been made on knowledge transfer. The progress of GGP research represents the development of artificial general intelligence to some extent, which makes it remarkable.