what version of the game do you have?
I have the Sega Genesis Version, the 2nd level is the train, but their arn't any doors
http://stud1.tuwien.ac.at/~e9125985/...uter/Games.htm
I count 11 versions of the game there
greg may be able to help, or you could see if that page has any codes for your version
and oh yeah:
Welcome to the Raven, Where Paths Cross