Crystalis

Crystalis, originally released in Japan as God Slayer: Haruka Tenkū no Sonata (ゴッド・スレイヤー はるか天空のソナタ, lit. "God Slayer: Sonata of the Far Away Sky"), is a 1990 action RPG/action-adventure video game produced by SNK for the Nintendo Entertainment System. Though Crystalis never became a runaway hit, it is now considered a cult classic. The game's initial success prompted a release for the Game Boy Color by Nintendo Software Technology in 2000, which is generally considered more of a remake than a simple port.