Super Mario World/Forest of Illusion 3

There are two ways to beat this level. One is to simply finish it the regular way which will make a path to the Forest Ghost House. The second way is by going down the last green pipe (you need to be super Mario) and getting the key. The ghost house will take you on a path leading to the Star Road, a short-cut to Bowser. The key exit takes you to Roy's Castle.