Hidden Extras
Collect all 125 hidden puzzle pieces.
Klaus
Klaus has a ability to do more with flying with Violet's invention. Use Klaus for that to fly over things.
Making the Fruitflinger
Go up to the West Hall. There is an enemy around the corner. With Klaus, go to the wall and wait, then hit her. Go to the cabinet and push it. Go in the secret room. On the way to the piano in the main room, there is fan. Take it. Then, go to the kitchen . Another enemy is there. He will throw three meatballs at you. After he throws them at you, run up to him and hit him. Repeat the process until you win.
Get Violet across the rats
In the Cellar after you get Klaus across the goo (which is drained by Violet), you must find a way to get Violet across. You cannot clear out all the rats. You must run past all the rats and find a wheel. When you do, press [B]. The pathway will fill up. Then, use Violet's "Steady Stilts" to get her across. Note: Watch out for the steam pipes.