Well there is this Super Mario World Level maker on the intenet called Super Mario Flash. You can make Super Mario World levels on your computer/laptop and share it with other people worldwide. Here is the link to it if your interested:
http://www.pouetpu-games.com/index.php?section=2&game_id=1&w=640&h=480
how do you pass world 6 on level 6 on new super Mario bros
look up super Mario bros Cannon world 1 and level 1
no in new super Mario bros there is no level 0 there is only worlds like world 1,2,3,4,5,6,7,8
On the last level of world 2 use tiny Mario to fight the monster and you can get to world 4 with tiny Mario
In Super Mario World 2: Yoshi's Island, The game autosaves after you finish a level.
beat level 7a
It's a cloud level, then it takes you to World 8, which is a lava level .
beet world 5 boss as mini Mario
You have to defeat Bowser with Minny Mario on the last level of world 5.
Complete level six on world eight.
beat level 4 6
World 4-4