You go to the temple of the ocean king and go to the next available floors and you need to go to the door and draw a hourglass on it. When you enter, you find a map with a symbol on it, close your DS, DS light, or DSi to give you the location of the key. Then eddo invents a salvage arm. get it, then go to the location on your map, use the salvage arm, pull up the chest and in it is the key. then you can open the door.
You tap it.
Go to molida island and go in the secret dig cavern you found earlier and open the door with the sun on it (with the sun key...)
You Might have remembered in one of the caves Ciela said that something reminded her of that door it was a sun on the door the sun key is the key to that door
You can open a key lock on a door knob, or you can open a deadbolt lock on the door itself.
After you have gotten the sun key, sail to Molida Island and use the key to open the odd door with the sun crest on it (found by digging underground). This leads up to the Temple of Courage.
To use a key to open a locked door, insert the key into the keyhole and turn it in the direction that unlocks the door. Make sure the key fits the lock and is turned fully to open the door successfully.
take the second passage way and use the sun key to open the door
Get the sun key!
To open a door with a lock, you will need the corresponding key. Insert the key into the lock, turn it in the direction that unlocks the door, and then push or pull the door open. If you do not have the key, you may need to seek assistance from a locksmith or someone who can help you unlock the door.
Surely there is a key lock on the door where you can insert the key and open the door.
wal-mart
Use the key to open the door.