New Super Luigi U: Layer-Cake Desert-3 -- Piranhas in the Dark

Take the pipe underground into the dark cave. There are giant Piranha Plants, some of which breathe fire. The fire and the lights on the moving platforms provide some light. The first Star Coin is over a giant Piranha Plant. The second Star Coin is on the right side of a platform, behind a giant Piranha Plant. Kill the Piranha Plant and stand on the platform. It will eventually dip down so you can get it while standing on the platform. Over solid ground is an item block with a Yellow Baby Yoshi. It will help illuminate the area. Ahead are some Fire Bros and more giant Piranha Plants, some of which are on the ceiling or overhead pipes. One of the giant Piranha Plants is hanging from a green pipe. Kill this Piranha Plant (you won't have time to kill all of them, but you can kill some of the other ones) and go through the pipe. There's an 8-bit Luigi behind the Piranha Plant. The pipe will take you to the third Star Coin and the flag.

New Super Mario Bros. U: Soda Jungle- Ghost House -- Which-Way Labyrinth

This Ghost House is another maze of doors. There are five doors in the first part of the room. The fastest way out of here is as follows: Take the lower left door. This leads to a dark room with a rising floor and Boos. One of the item blocks has a Yellow Baby Yoshi. Hold Yellow Baby Yoshi and spin to light up the room temporarily. It also eats Boos. As the floor rises, stay to the left. When the floor gets close to the ceiling, there is an invisible area on the left side, so you won't get crushed. Quickly run to the right and go through the door. This leads to another dark room with Boos. The floor will drop out from under you and you'll start falling. You'll land on a level that will also disappear. Quickly run to the right before the floor disappears and you'll reach an invisible area with the third Star Coin. At the bottom is the door to the red goal. This opens the path to Soda Jungle- Parabeetle.

To reach the regular goal and get the other two Star Coins, go through the upper right door. It leads to a dark room with a couple of Broozers, that will punch barrels at you. In the center of the room is a floor that will descend when you stand on it. While it descends, go to the left for the first Star Coin, avoid the Broozer, then jump back up and make the floor descend again. This time, go to the right to a door that will take you back to the first room with five doors. This time, take the lower right door, which leads to a dark room with rats. You'll only be able to see their eyes glow at first, but to the right is an item block with another Yellow Baby Yoshi. In this room, you'll move right to left. The P-Switch makes Silver Coins appear. Go past the door you see at ground level and go up and to the left to a hidden area that leads to the upper door. This bring us to a part of the Ghost House that's above the five doors. Go up the stairs and up and over to the left of the door at the top of the stairs. You'll drop down to the second Star Coin. Wall jump out, then go through the lower door. This leads to a room with a tilting floor that descends. There's a giant Boo or two in the room. The floor will drop to the level of an item block with a Starman. Put the Starman to good use until you reach the door at the bottom. This leads to the regular goal, opening the path to Soda Jungle-4 and -5.

New Super Mario Bros. U: Layer-Cake Desert-3 -- Fire Snake Cavern

It's another underground level. Grab the Ice Flower outside and take the pipe underground. This cavern is dark, but has a few lights in it. There are lots of Fire Snakes in the cavern, but the Ice Flower can extinguish them. Some of the lights in the cavern are attached to tilting platforms. The second set of tilting platforms will allow you to reach a high ledge with the first Star Coin. Making life difficult while providing some illumination are the occasional Fire Piranhas. In an item block is a Yellow Baby Yoshi, which glows for better visibility. It also eats most enemies, including the Fire Snakes. It can't eat Fire Bros, which appear before the midpoint. There's a low pipe which will take you to a 1-up and some Piranha Plants. There's a Red Coin Ring nearby. The next set of tilting platforms has brick blocks in it. Break them to reach a pipe below. It takes you to the second Star Coin. Afterwards are more Fire Snakes and a P-Switch. Soon, you'll come to some more tilting platforms with Fire Bros. Over the first Fire Bro is a pipe to the third Star Coin. Afterwards, continue to the right, take a pipe above ground and go to the flagpole. This opens the path to the Fort.