Computational Complexity of Approximate Nash Equilibrium in Large Games
  We prove that finding an epsilon-Nash equilibrium in a succinctly representable game with many players is PPAD-hard for constant epsilon. Our proof uses succinct games, i.e. games whose payoff function is represented by a circuit. Our techniques build on a recent query complexity lower bound by Babichenko. 
Aviad Rubinstein
cs.GT