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 up to the ghost house. The second way is by going down the last green tunnel (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, I would take this path. the key exit takes you to Roy's castle.