Japan's version of Super Mario Bros. 2 was NOT the same game as the one we all know in the US. In Japan SMB2 is a direct sequel to Super Mario Bros. and has the same graphics and enemies. Only a few minor changes appear in the game, such as the inclusion poison mushrooms. Also, the game is far more difficult than SMB, which is one reason why it wasn't initially release in the US.

The game that we Americans are familiar with is known in Japan as Super Mario USA or Doki Doki Panic. It was never developed as a Mario game, thus the cast of strange characters that never appeared in the original Mario games. Nintendo simply swapped the original Doki Doki characters out for Mario characters, and kept all the other assets unchanged:


Eventually the Japanese version of Super Mario Bros. 2 was released in the US under the name Super Mario Bros: The Lost Levels and received a visual upgrade thanks to the power the Super Nintendo.
The game was again rereleased in Japan on the Game Boy Advance in 2004 to celebrate the 20 year anniversary of the Famicom system. It quickly became one of Japan's best selling GBA titles that year.
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