The door outside the Iceberg Ruins reads:
|“||Let ring the piercing note that will wake the giant of steel.||”|
By whistling in front of the door, it will open.
Inside the ruins, there are several light switches on the floor, resembling Registeell's eyes, similar to the counterpart in Sinnoh. By stepping across the switches, they can be turned on or off, and if all switches are turned on, the ground shakes and the statue on the north wall will activate. By interacting with the statue, Registeel is battled.
- The Iron Ruins, along with the other ruins of the Legendary Giants, reference the past games: