Red Key

In Golden Sun, the Red Key (あかいかぎ Red Key) is found on the third level of Crossbone Isle. It is used to open a red door that keeps players from moving on to the next level.

In Golden Sun: The Lost Age, the Red Key is an item found in the Jupiter Lighthouse. It grants access to one of the two "towers" where the player must activate a statue figuring a bowman in order to open the top of the lighthouse.