How do I get the 9th castle secret star (metal cap)?
  • 1 of 5: Outside the castle, turn left to go to the underground lake.
  • 2 of 5: Use the sea creature to get to the island with the red wire frame in front of it.
  • 3 of 5: Follow the green hallway to the room with the black metallic pool in the center and jump in.
  • 4 of 5: Find the large green switch at the end of the level to activate the green "!" boxes.  You can now access metal caps in certain levels. 
  • 5 of 5: If you find eight red coins on this level, you can get another castle star.