yume koujou: doki doki panic
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A Japan-exclusive platforming video game developed by Nintendo in cooperation with Fuji Television for the Famicom Disk System to promote its event called Yume Kōjō '87.
It was later released outside of Japan in an altered format under the name Super Mario Bros. 2, since the original Japanese Super Mario Bros. sequel, Super Mario Bros.: The Lost Levels, was deemed too similar to the original and too difficult for overseas players. Eventually, the altered Super Mario version of Doki Doki Panic was released in Japan as well, under the title Super Mario USA.