The Black Onyx

This landmark title is a port of the classic personal computer RPG to Sega’s SG-1000 My Card format. By featuring本格的な (authentic) dungeon exploration—a rarity for home consoles at the time—alongside its unique wireframe-style graphics, it helped lay the foundation for future home console RPGs. The adventure, set in the exotic city of Utsuro in search of the dark gem known as the "Black Onyx," shocked players of the era. As a pioneering effort that sought to recreate the true thrill of RPGs on a home television screen within the constraints of limited hardware, the game continues to hold significant historical value.

According to an ancient legend, the Black Onyx, a gem said to bestow eternal youth and boundless wealth, is hidden in the Black Tower on the outskirts of the cursed city of Utsuro. Seeking this gem, the player visits the city and steps into an underground labyrinth slumbering beneath the ruins. You must overcome many trials and aim to find the mysterious treasure rumored to be somewhere within the Black Tower.