Abstract: This invention relates to a novel structure of a ball type "figure-guessing" game, and in particularly refers to the structure of game which is composed of several cases, a base and a top plate. All cases have identical outer appearances to the naked eye, making it difficult to distinguish their differences; each case differs from the other cases only in internal structure. By random arrangement of cases by the player, a solution number is generated. The player can input his guess by placing balls in a top plate; the balls take different paths in the cases, to ultimately provide hints that enable the player to revise his guess, until his guess matches the solution of riddle.