Enter "AAAABLFJSIMON" as a password, to skip directly to the final room. In the final room you have two choices of action depending upon the ending you wish to see:

Normal Ending: Move Left(4), Down, Up, Left(2), Right(2), Down, Left, Right, Down, Fire, Right, Up, Down, Fire, Down, Fire(4).

Alternate Ending: Move Left, Right(2), Down, Left, Right, Down, Fire, Right, Up, Down, Fire, Down, Fire(4).