A board game includes a board assembly and an operation unit mating with the board assembly. The board assembly includes at least one outer frame, at least one inner board mounted in the outer frame and a plurality of separating edges located in the outer frame and the inner board to separate the outer frame and the inner board respectively. The outer frame of the board assembly includes a plurality of sections which are juxtaposed and combined to form an endless loop. Thus, the outer frame and the inner board of the board assembly co-operate to function as a monopoly and a puzzle so as to enhance the amusement of playing the board game.