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using Treeki and Dirbaio 's editor(NSBMe5), i made some stages.
if you want to see a video, here is a link.
video
it's full of ad.. so i don't recommend.
world 1 is crashed world. you should clear with special conditions.
world 2 is bug world. you have to use bugs to clear the stages.
all stages can be cleared with normal(small) mario.
if you cleared original NSMB, and you think that is so easy, try this.
this won't be easy..
to patch, you have to put your U rom in xdelta folder.
it contains DSATM patch which gives you infinite lives.
it means.. TT can't play this...(sorry)
sorry for the poor English