I gave this game to my daughter and i helped her everytime i can, but now i'm in that level and i have already found 4 pillars but now i can't find the last pillar too.. I found a door and i don't know how to open it. I played at least an 100 times and i just don't know what to do.. Is the last pillar behind that door? How can i open it? Please someone help us!! :/