Pachio-kun FX: Maboroshi no Shima Daikessen is a casino game set on the Ghost Island. The story follows Pachio-kun, a mascot for pachinko, as he sets up a tournament to defeat seven skilled opponents. The player can choose from multiple characters, each with its own anime FMVs during gameplay, but this choice does not affect the outcome.
The gameplay revolves around defeating the seven pachinko masters, who can be encountered at various locations on the island. To succeed, players must use their skills to control a pachinko machine and freeze an opponent's ball in time. This is achieved by playing alone in pachinko parlors, gathering balls and special points.