(I was just about to write about this:)
As a note: jumping
over the flag pole
in 3-3 (or was it 3-2) only lets you run forever
. It does NOT allow
you to get into minus world
. That is simply another common bug
. (Also, small firey looking Mario
is common). I have only heard of the jumping backwards
1-2 reproducing it. I don't know if jumping out of the water is possible
Minusworld is most certainly a bug, however. Yerricde gives an excellent description of why it is in the writeup below this one.
Update, i decided to give the minus world trick the old sporting try, and I got it to work under an emulator. However, I went down the second pipe and ended up in world 5. Quite a nice "feature" if you ask me.