The first game in the Seiken Densetsu (aka “Mana“) series was released on the black and white, handheld Nintendo Game Boy in June 1991.
It’s a spin-off from the famous Final Fantasy series, also by Square. In Japan the original title was Seiken Densetsu: Final Fantasy Gaiden (translating as “Holy Sword Legend: Final Fantasy Side Story”). In the West it was released under the title Final Fantasy Adventure.