91A05 2-person games 
91A06 $n$-person games, $n>2$
91A10 Noncooperative games 
91A12 Cooperative games 
91A13 Games with infinitely many players 
91A15 Stochastic games 
91A18 Games in extensive form
91A20 Multistage and repeated games 
91A22 Evolutionary games 
91A23 Differential games [See also 49N70]
91A24 Positional games (pursuit and evasion, etc.) [See also 49N75]
91A25 Dynamic games
91A26 Rationality, learning
91A28 Signaling, communication
91A30 Utility theory for games [See also 91B16]
91A35 Decision theory for games [See also 62Cxx, 91B06, 90B50]
91A40 Game-theoretic models
91A43 Games involving graphs 
91A44 Games involving topology or set theory
91A46 Combinatorial games 
91A50 Discrete-time games 
91A55 Games of timing 
91A60 Probabilistic games; gambling 
91A65 Hierarchical games 
91A70 Spaces of games 
91A80 Applications of game theory
91A90 Experimental studies 
91A99 None of the above, but in this section