Mega Mario World : Another Universe is one of the greatest Mario World hacks made in my opinion.  This hack has everything.  All new levels , New graphics, New Music ,  NEW POWERUPS, The Water backpack,  Submarine , Airplane , Levels designed after other mario games, and MUCH , MUCH MORE!!!   I thoroughly loved playing this game.   The Author is from a foreign country so some words are mispelled but that , in no way, affected the fun of this game.   If you are a Mario fan then you will LOVE this game.