Golvellius is an action adventure video game for the Japanese MSX home computer system that plays much like The Legend of Zelda. It was developed by Compile and released in 1987. Sega licensed the franchise in 1988 and released their own remake of the game for the Sega Master System (the Mark III in Japan), featuring enhanced graphics and entirely different overworld and dungeon layouts. This game got released worldwide under the name Golvellius: Valley of Doom. Source: Wikipedia, "Golvellius: Valley of Doom", available under the CC-BY-SA License.