sentences:  "Pac-Man" (1980) became Namco's biggest success, selling over 400,000 arcade units in the United States alone and becoming one of the highest-grossing video games of all time.It was designed by one of Namco's new hires, Toru Iwatani, with Nakamura suggesting the game be named after the sound the character made while eating, "paku paku".In a 1983 interview, Nakamura said that he "never thought it would be this big".