How do you get the boss key in Zelda spirit tracks for the ocean temple?

Answer 1

Use your whip to activate the helicopter, then use the whip to grab the helicopter. (when you grab it, keep the stylus on the screen.) Then drop yourself onto the moving block (make sure you see Link's shadow, which looks like a black circle, on the block before dropping yourself) then wait until the block reaches the platform in the middle of the room, which has the boss key. Pick up the boss key, the stand on the switch, to extend a bridge. But be careful, hands will appear and try to take your key. Drop the key and stand in front of it, and wait for the hands to come to you. You can either use your whip or your sword to kill the hands. When they're all dead, take the boss key and unlock the boss door!

Answer 2

Once you get to the top floor, when you go left you see some torches there is a sign on that floor that tells you witch torches should be fire and ice. After you complete the puzzle you go to your right to fight some wolves. after beating them go to your right then down there is i switch that you step on to make a bridge. Now take out your whirlwind and blow the key onto the bridge and pick it up.