The first door from the right on the ground floor of the castle. The door is marked with 3 stars. One of the secret stars is inside this room.
ONE
After the giant eel swim out from the ship, swim into the ship through that hole. Then open the 4 chests in sequence, and collect the star in the yellow ! box.
TWO
Catch the star at the tail of the giant eel after it swims out from its place.
THREE
Swim passes the underwater tunnel. Go to open the 4 chests in order.
FOUR
Collect 8 red coins.
3 are inside 4 of the clams in shallow water.
Another one inside a clam in deep water.
Top of a stone spike near Red Bob-omb.
Last 3 are on the ship. Mario can get there by shooting himself from the cannon.
FIVE
Shoot Mario from cannon to the left most stone spike, climb to the top and jump to the platform to get the star.
