Hello I need some help. I missed one of the lucky emblems in the game. It's the one on the archway. I have finished the world and came back to the middle tier. After using airstep twice from the low tier to the middle tier area, the only way forward is the bridge with a hidden mickey on the left side. The two doors, left and right, are blocked by a wall of ice. I can't go past them and go back to the area with the archway emblem. Am i basically screwed?