The Giddy Goons level appears in the 8-bit home computer version. In this version they look like abstract rodents or kangaroos wandering on tall ramps, instead of stairs. Dirk has to jump from ramp to ramp.
In some versions the Giddy Goons level is the first level of the game. In other versions it is the fifth level.
Along with a few other enemies, the Giddy Goons have their name spelled out by a caption in the original game's intro.