If service mode is on, a secret message can be displayed. Hold the Super Speed button and press Right, Down, Down, Left, Left, Left, Left, Up on the joystick. If entered correctly, this message ...

Afterwards, let Pac-Man walk up to the pebble and kick it into the boulder just below (if he is too sad to kick it, try clicking on the watery stream in the area below and return). Afterwards ...

In the original Pac-Man (released in October 1980 as an arcade game in Japan), the ghosts, also known as the "Ghost Gang," each had unique AI traits that contributed to the game's enduring appeal.