In a 1994 interview with the game's creator Shigeru Miyamoto, featured in the liner notes of "The Legend of Zelda: Sound and Drama" CD, Miyamoto revealed that his team started development on the game as a launch title for the 1984 Famicom Disk System. Shortly before that, they began working on Super Mario Bros., which lead to a period of 5 to 7 months where they worked on both games simultaneously, consequently causing the design stage of development to be very busy.