The release date of Super Mario Bros. ((Super Mario Bros #citation)) in Japan was September 13, 1985.
The release date in America is unknown ((We Can't Prove When Super Mario Bros Came Out #citation)) due to lack of solid documentation. Popularly, most people say that Super Mario Bros. wasn't released until 1986 when the game was bundled with the NES. Because the bundle was extremely successful, most people got the NES with Mario included and so combine the two events.
The actual release date is sometime in either October or November of 1985. Either October 14th, October 18th, October 19th or November 17th. Each date has some credibility, but not solid enough to be used officially.
#lomario #toolong