World 5: Ghost House

Coin 1

In the first room, jump the gap and head through the first door. Now head to the back of the second room to find a hidden area in the wall, just below the furthest door, with the first Star Coin.

Coin 2

From the first room again, drop down the first gap, then the second as well and go through the door on the left to wind up in another room full of boney-fish. Head to the other side to find the second Star Coin just past the door.

Coin 3

In the first room again, drop down the first gap, hop the second, then climb the stairs and drop into the gap beyond to find two doors. The one on the left is fake, so take the right one. Here, you'll find two circles comprised of Boos--the Star Coin is inside the second one.

Alternate Route There's a hidden route inside the ghost house that, when taken, allows access to the cannon on the world map that'll blast you to World 8. So here's how you find it: Inside the Ghost House's first room, drop down the first shaft, jump the second, climb the stairs and jump the third. Drop down the shaft at the otherwise dead-end, then drop down the gap just beyond to find a door. Ignore the door and head left through a fake wall to find a second door. Head on through--this will eventually lead to the alternate exit, granting access to the cannon.