  We study the existence of classical solutions to a broad class of local,
first order, forward-backward Extended Mean Field Games systems, that includes
standard Mean Field Games, Mean Field Games with congestion, and mean field
type control problems. We work with a strictly monotone cost that may be fully
coupled with the Hamiltonian, which is assumed to have superlinear growth.
Following previous work on the standard first order Mean Field Games system, we
prove the existence of smooth solutions under a coercivity condition that
ensures a positive density of players, assuming a strict form of the uniqueness
condition for the system. Our work relies on transforming the problem into a
partial differential equation with oblique boundary conditions, which is
elliptic precisely under the uniqueness condition.
