New Super Mario Bros.

Unusually difficult for Level 2. First there is a space halfway through the level that you have to walljump into. Now, in the next room, you will have to repeatedly walljump in the box. You'll see the coin if you get far enough up.

Do you mean the tower or castle?

Once you ride the pin wheel to that fist rope you cross. go up the next pinwheel and at the wall (left side of screen) walljump onto the little shelf continue to jump up till you reach the the door at the top. once you are through the door you still have to wall jump up the moving yellowing thing. just fpllow that and you should find it. good luck.