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. 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 the game's difficulty, this game was not released in the United States until it was released for the Super Nintendo as part of Super Mario All-Stars, where it was referred to as "Super Mario Bros.: The Lost Levels". It has since then been re-released (only in Japan) on the Game Boy Advance and made available for download on the Wii Virtual Console.