Information posted at Nintendo.com shows that the DSiWare version of the game won't be fully identical to the original -- it features multiple difficulty modes, a boss rush, and a music player.
Oh Yeaaah!! Here's Cave Story on DSiWare

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Information posted at Nintendo.com shows that the DSiWare version of the game won't be fully identical to the original -- it features multiple difficulty modes, a boss rush, and a music player.