To be able to enter Island Cave the player must complete Sealed Chamber's puzzle. Inside there is a door with braille on it, which leads to the room where Regice is located. In Ruby and Sapphire it reads "Stop and wait. Wait for time to pass twice." and to open the door the player must not do anything for two minutes. In Emerald it reads "Stay close to the wall. Run around one lap." and to open the door the player must run counter-clockwise around the edge of the room.