Crystalis is an intriguing game released by SNK for the NES many years ago. At first glance, it's a Zelda clone, but upon closer inspection it actually feels more like an Action/RPG. It plays very fast and can be very tricky if you don't know what you're doing. ...also, the story is VERY hard to follow, which given this game's original title of "God Slayer"... yeah... something was probably lost in the localization... :P