  The gauge/gravity duality provides us with nonperturbative formulation of
superstring/M-theory. Although inputs from gauge theory side are crucial for
answering many deep questions associated with quantum gravitational aspects of
superstring/M-theory, many of the important problems have evaded analytic
approaches. For them, lattice gauge theory is the only hope at this moment. In
this review I give a list of such problems, putting emphasis on problems within
reach in a five-year span, including both Euclidean and real-time simulations.
