Open the Level's Properties (press the Yellow level Button) that You have made Mario Start on, then Change the Following:
Initial Directions (up/down/left/or right)
--Check whichever Direction you want Mario to be able to walk
Level Has Been Passed
--Check this Box (this sets up for the next thing)
Unable to Enter level if Passed
--This makes it so Mario Cannot in no way enter this level, if you have "Level has been passed" Checked.
I believe that Will fix your Problem ;)
Originally posted by Trevbo
(Sorry if this was no more clear than last time).
Don't Worry About it.. Some things are Hard to explain
I believe all of those level tiles do the same thing.. I have never experianced any Difference between them...