Sky Robo was released in July 1989 in Japan. It was Nichibutsu's last arcade video (non-Mahjong/Hanafadu) game. After Sky Robo, they focused only on Mahjong and Hanafuda games because excutives and president of Nichibutsu where no more interested by general arcade video games. They fired almost all developers.
Sky Robo is one of rarest arcade video game developed by Nichibutsu.
Mandora, the final boss of "Terra Cresta
", appears in the final stage of this game.