@Marshmallo:... in World 7-1 on the right there his an upside down pipe, at the start of the level, if you clip into it from the right and press down, you will enter it the wrong way, and it will drop you in the RAM data of the level, and just to the right of that there his a note block, that you can't see, and hitting that note block cause the game to look in the level for its information...