Before revision: This paper proposes a new equilibrium concept "robust perfect equilibrium" for non-cooperative games with many players . Such an equilibrium is shown to exist and satisfy the important behavioral principles of admissibility, trembling-hand perfection , and ex post  perfection.
After revision: This paper proposes a new equilibrium concept "robust perfect equilibrium" for non-cooperative games with many players . Such an equilibrium is shown to exist (in symmetric mixed strategies and in pure strategies) and satisfy the important behavioral principles of admissibility, trembling-hand perfection , and ex post perfection.