Here is S.N.N.'s true SMW hack (an unfinished and never will be finished but still large demo), Mario's Keytastrophe. It highlights the beginning of custom music (asides from Super Mario All-Stars) being added in SMW hacks. This soundtrack is almost entirely original (as in S.N.N. made it), much like AxemJinx's Rise to the Challenge. Plus this hack uses puzzle elements and even music elements (I knew music was good enough to merit is own hack!). As you get more exits, you open up more and more things, including some that were in earlier levels.
Romhack - S.N.N.
Gameplay - SMCslevelengine
Original SMW - Nintendo
levelengine presently has 690,106 views for Super Mario World across 1,525 videos, accounting for over 28 days of watchable video on his channel. This is 18.28% of the total watchable video for Super Mario World on levelengine's YouTube channel.
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