Books like The Game of Sunken Places

When Brian and Gregory receive an invitation to stay at a distant relative's strange manse . . . well, they should know better than to go, since this is a middle-grade adventure novel. But they go anyway. Why not? Once there, they stumble upon The Game of Sunken Places, a board game that mirrors a greater game in which they have suddenly become players. Soon the boys are dealing with attitudinal trolls, warring kingdoms, and some very starchy britches. Luckily, they have wit, deadpan observation, and a keen sense of adventure on their side.