The Legend of Zelda: Fourth Quest is a ROM hack/mod of BS Zelda no Densetsu Map 2 and, consequently, a sequel of another mod called The Legend of Zelda: Third Quest. It was developed by Con, with additional code by other ROM hackers of the BS Zelda scene. The mod intends to make BS Zelda no Densetsu Map 2 closer to a traditional Zelda experience, with the ability to play as Link or Zelda and changes to the engine of the original game which was heavily based on a time-limited gameplay, making it directly related to story progression.