I've finished all three worlds near Decalburg. I'm stuck in Surfshine Harbor. There is a hint that there is a hidden treasure in the Yoshi Sphinx (W2-2) which I think I found (the Lighter) However I can't find which sticker is required in Surfshine harbor to light the dark basement that you find behind the second warehouse door. Please help. I'm not sure, but there is a "?" block in the Sphinx that I can't get to. You place a sticker and a second box appears but I still can't reach the top "?" box.