12 Labours of Hercules XVIII: Ghost Sheep - Collector's Edition is a single-player puzzle and adventure game in which players help Hercules battle mischievous ghosts, restore balance to Hellas, and unravel ancient mysteries. In this game, Hercules faces the chaos unleashed by his accidental disturbance of the underground river Styx, which causes floods, awakens curses, and disturbs the underworld, prompting him to restore harmony across cursed landscapes. It stands out with its inclusion of bonus content such as an interactive guide, wallpapers, and extra sheep, along with advanced gameplay elements that challenge players' wit and strategic thinking as they navigate mythological themes and mythical beings.