Phantasy Star Gaiden (ファンタシースター・外伝 Fantashī Sutā Gaiden?) is a role-playing video game developed by Sega for the Game Gear portable system. Released only in Japan, the game takes place in the same universe as the original four Genesis Phantasy Star games. This game features the same top-down view and first-person battles, with the biggest difference being that there's a maximum of only three members allowed in the party. It was released a few months after Phantasy Star Adventure in Japan, which was the first Phantasy Star game for the Game Gear system.