New Super Mario Bros. Tips

How to finish the ghost house level in world 7
When your up to the ghost house in world 7,you will find three blocks, one of them has a "?" switch, jump on it and 5 doors appear.Go into the door on the bottom right hand corner.You will go into a room with lots of hands on top.
In the middle there is an invisible ? block.
Keep jumping in the middle until you hit a block.
A ? switch will appear.Jump on it andtwo levers will appear.Use the high jump pad to go on it then jump onto the stand to continue