New Super Mario Bros.: 1-2

It's time for the first underground level. As the level is underground, it takes place on the Touch Screen, so you can't access your reserve item. We can pound the brick blocks to drop down for lots of coins. The first Star Coin is on a ledge to the right of the set of three brick blocks. As we keep going to the right, we'll find several brick blocks somewhat shaped like a tower. We can pound the top brick block to drop down to the second Star Coin. We take the first pipe to an area below and find more coins and a Koopa Shell, which we use to destroy the brick blocks under the pipe. This leads us to a new area with some Goombas and a Mega Mushroom. I got 2 1-ups from here. We go back to the main level through the pipe and use a tilting platform to reach an area on top of the rock that forms the ceiling. We run to the end to find the 3rd Star Coin and a pipe to the red flag goal. The red flag goal opens a shortcut to the fort, bypassing 1-3. It also opens access to a Toad House. To reach the regular goal, keep going right. It opens the path to 1-3.