Whacker Man is a whack-a-mole style game. One mole is shown before it is struck by Steven with a mallet. The mole is themed as the 1920s-1930s criminal gangster; it is dressed in a suit, with a fedora and sunglasses, and has a gun pointed at the player. The mole makes a grunting noise when struck.
It's whacking time!
|—"So Many Birthdays", Start of game|
You're gonna get whacked!
|—Gangster mole, "So Many Birthdays"|
- Another arcade game in Funland Arcade, Whacker Man Jr., is a spinoff of Whacker Man designed for children. It doesn't appear to differ in any way.
- The naming convention of the Whacker Man series mirrors that of popular arcade series such as Donkey Kong/Donkey Kong Jr. and Pac-Man/Jr. Pac-Man.