US Patent 7717780 Game machine and game program

A game machine is comprised of means for producing a field having two or more stages which are connected with each other on world coordinates, means for respectively locating two or more characters appearing in a game in the stage, means for locating an operation character, means for computing a character density in the stage where the operation character is located, means for judging as to whether or not the character density is lower than a predetermined character density, means for computing a number of short characters, and means for extracting the short characters from the stages other than the stage where the operation character is located and relocating the short characters.