Meaning: People who are fond of each other and enjoy each other's company engaged in games or sports for the entire duration of the daytime.
Choice of Words: The word "friends" refers to people who are fond of each other and enjoy each other's company. "Played" means engaged in a game or sport. "Games" refers to activities involving competition or recreation. "All" means the entire or whole extent of something. "Day" refers to a 24-hour period.