Fighting in the Underground World
Blow the hammer against the red button to turn on the light and move on to the right. At the end of the corridor, you save a Toad who is the owner of the museum in Toad Town. There you can now look at your treasures and other collectibles. In the next course you have to set the light again and then fight against bats. The same goes on in the third section, except that there are additional mice waiting for you here.
Leave the water off
Finally, you reach the area with the green warp pipe. Climb down the ladder to the south and go to the red handwheel. Examine the pit in the wall on the left and mice rush out that you must defeat. Then you can turn the handwheel with the folding circle and let the water flow out of the area.
Climb the ladder again, go down the stairs and get the treasure mini #16. To the right of the green warp pipe, a staircase leads up. Go south past the railing, where is an invisible one above the striking floor plate at the end? The block is located. Then you can walk down the stairs to the right to free a toad in the next room. Finally, use the Warp Pipe to get to Mushroom Castle.
Toads
Treasures
? Blocks
Holes