A game processing device determines, for a moving object in a game field, a first region in which a first operation performed on the moving object is valid. The first region is set in the game field in a movable region of the moving object. Further, the game processing device determines validity of the first operation based on the first region and a position of the moving object. In addition, the game processing device validates a second operation that is different from the first operation performed on the moving object if the first region reaches a second region that is within the first region.