if you are taliing about the one WanWan was trying to help with, i know how to get the secret exit.......bring yoshi as far into the lvl as you can. you should come to an area with a bunch of chainsaws and a gap it appears yoshi cant get across. Hold Y, run to the edge of the platform, jump and then hold B. If done correctly, yoshi will bounce off all the chainsaws and you will land on a platform just before the exit. Have a cape on and jump and drift (with yoshi) under the posts. Then spring off yoshi, land on behind the first exit, and you will find the secret exit!! for more info, check tmks smw guide......
you really dont know, do you??