LEGO Harry Potter: Years 1-4 Q&A

I get that you need to use wingardium leviosa to put it together, i've been trying for hours but the pieces won't click into place.

I have unlocked a few characters but when i open up the character list there not there, can someone tell me why?

do u know any codes to get like er...oh yes score x 10

i am stuck on how to open the stuff that has the red dots around them like in dumbdores office.

almost 100% done but for some reason when i get out of hogwarts it says i cant use gold cauldrans i need the polyjuice potion, i thought i got it is there a way i can go back and get it???

how do you retrieve the shield piece in the black lake level

I cannot get past the gate to get any farther along. What did I miss?

How do you get dunmbledore??

How i can go to diagon alley?

I'm stuck in the forrbin forest trying to save harry and draco, but i'm stuck?

Im at the part where i have to fix Harry's arm. I have to find 3 things to the potion and i cant find the pink claw type ingredient. Please help. I've been looking for it for 10 minutes :(