"Ghosts 'n Goblins is a run and gun video game series developed by Capcom. The main series contains four games: Ghosts 'n Goblins, Ghouls 'n Ghosts, Super Ghouls 'n Ghosts and Ultimate Ghosts 'n Goblins. The series as a whole have sold over 4 million units, and stand as the 9th best selling game series of Capcom.
In addition to the main series, the greater Ghosts 'N Goblins franchise incorporates the three Gargoyle's Quest games and the two Maximo games."
Source: Wikipedia, "Ghosts_'n_Goblins_(series)", available under the CC-BY-SA License.