[Deathknight]

actually, there's a program to hack the levels in the rom of the original and all-stars version of SMB3 already. A very confusing utility but you do get the option of looking at the levels that never were on the original game. Those you of who remember the box it showed pictures of levels on the back that you never encountered in the game. They can be unlocked using this utility, or you could just change the levels for fun. SMB3 owns!