Go to the Cheese Bridge Area and go past the middle gate. Go a little past the blue pipe, and you'll find a long rope that you can hang onto that goes back and forth. Jump onto it and then go down the rope. When you touch the ground, Mario will be standing like when he's normally standing, but he'll be still attached to the rope - going back and forth. If you walk a little bit left or right, you'll have some resistance and when you let go of the direction, Mario will slide back to the rope. However, if you jump or move too far, Mario will become unattached from the rope.
Submitted by: kornyhatemachine