I have just grabbed the treasure from the Giant in the clouds and received the ring from an elf. I am supposed to jump on a bird and go across somewhere. It says I must use key 0. I can't seem to get it to do anything. It (the walkthrough) says in the right corner of the scence with the open cave, use key 0 to jump on the brid. Do use the ring to be invisible? Is this correct and how do I accomplish this? Thanks.