There are a lot of programs that you can use but I would recommend Lunar Magic. You can get Lunar Magic and a lot of information about SMW hacking on http://www.smwcentral.net/
Download a package of Lunar Magic and a SMW Rom here: http://sharecash.org/download.php?file=365661
Download Lunar Magic. It's very easy to download, and free.
yes but only a few like super Mario world redrawn new super Mario ect. the only ones that i know that don't work are super Mario bros 3 redrawn and wario's world. (i use snemuldsv0.6)
easier than pong
you can't
sadad
Download Lunar Magic. It's very easy to download, and free.
sadad
yes
you have to hack
It's not technically illegal to do so, but it isn't something Nintendo endorses. You'll find many Super Mario World fan hacks on the internet if you do a search for some.
only unskilled losers hack fool...
sadad
geckocodes.org