Originally, Namco president Masaya Nakamura had requested that all of the ghosts be red and thus indistinguishable from one another. Iwatani believed that the ghosts should be different colors, and he received unanimous support from his colleagues for this idea. Each of the ghosts were programmed to have their own distinct personalities, so as to keep the game from becoming too boring or impossibly difficult to play. Each ghost's name gives a hint to its strategy for tracking down Pac-Man: Shadow ("Blinky") always chases Pac-Man, Speedy ("Pinky") tries to get ahead of him, Bashful ("Inky") uses a more complicated strategy to zero in on him, and Pokey ("Clyde") alternates between chasing him and running away. (The ghosts' Japanese names, translated into English, are Chaser, Ambusher, Fickle, and Stupid, respectively.) To break up the tension of constantly being pursued, humorous intermissions between Pac-Man and Blinky were added. The sound effects were among the last things added to the game, created by Toshio Kai. In a design session, Iwatani noisily ate fruit and made gurgling noises to describe to Kai how he wanted the eating effect to sound. Upon completion, the game was titled "Puck Man", based on the working title and the titular character's distinct hockey puck-like shape.