Cameo Appearance:
Planet Harriers (Arcade)
Opa Opa appears in this game, and can be accessed as a hidden playable character.
(Press Right, Down, Left, Up, Left, Down, Left, Up, Right, Left, Up at the character selection screen.)

Also, the shop music in this game is the same as in Fantasy Zone, and the Song 'Opa-Opa' is part of the games soundtrack too.