Phantasy Star Adventure

Phantasy Star Adventure is a first-person puzzle adventure game released in 1992 for the Game Gear prior to Phantasy Star Gaiden. Taking place at the same time as Phantasy Star II, it puts the players in the shoes of an agent of Paseo. He receives a letter from friend and scientist, Ken Miller, who is studying on the ice planet Dezolis and invites him to see an important new invention. Once there, the player learns that Ken and his device are missing, initiating an investigation. (wikipedia.org)