Things You'll Need
Instructions
Complete the first section of the "Ghost House" as normal. Enter the golden door at the upper right corner of your screen.
Walk left and jump on the red switch. This will cause red blocks to appear.
Run back to the right and jump on the red box that has appeared next to the green pipe. Jump on top of the pipe.
Activate the "Small Mushroom" so Mario becomes miniature. Jump as high as mini-Mario can, then wall jump against the left wall. This will propel Mario to a secret platform at the upper right corner of the screen.
Jump up so Mario enters a small area with two walls close together. Wall jump against these walls until you land on the platform with the golden door.
Enter the golden door. The red flag will be located on the right side of the screen.