Super Mario Bros. 2 (Japan)

Super Mario Bros. 2 is a sequel to the original Super Mario Bros., and was released on June 3, 1986 for the Famicom Disk System. It was the number one selling Famicom game released in 1986, selling approximately 2,650,000 copies in its lifetime. The game is very similar to Super Mario Bros., both graphically and in terms of gameplay, and is generally considered the most difficult game in the NES leg of the series. Unlike its predecessor, it no longer has 2 player mode (you have to choose either Mario or Luigi). It contains one new enemy, backward warp zones, wind, and poisonous mushrooms.

Due to its high difficulty and similarity to the original Super Mario Bros., this game was not released in the United States until it was released for the SNES as part of Super Mario All-Stars, where it was referred to as "Super Mario Bros.: The Lost Levels". It was also included as a hidden game in Super Mario Bros. Deluxe for the Game Boy Color, where it could only be accessed by defeating Luigi's high score, and was referred to as Super Mario Bros. for Super Players. It has since then been re-released (only in Japan) on the Game Boy Advance and made available for download on the Nintendo 3DS and Wii Virtual Console.