Super Princess Peach: Gleam Glacier -- 6-7

It's snowing heavily in the first area. Go left first to hit the ! Switch. This will allow you to go to the right. Go past the pipe, then use Chargebrella while jumping to hit another ! Switch. This makes yellow platforms appear. Cross the gap, then pound the ice floor to make the ball drop down. Use it to hit the ! Switch to the right so you can reach the pipe.

Cross the icy platforms with the Happy Piranha Plants and use the green ball to get over a ledge. There are more ice platforms and Piranha Plants ahead on the way to the pipe.

The pipe leads to an area with many pipes. Take the fifth pipe from the left to reach Level 8 of the Toad Jump minigame. Drop down the second gap from the left to find a pipe. This leads to the goal.

New Super Luigi U: Soda Jungle-4 -- Painted Pipeworks

This level has a Starry Night theme. There are Piranha Plants in the many pipes in this level, and some of the pipes move. Grab the Red Coins, if you like, for a Fire Flower. The first Star Coin is over a set of rotating pipes. The coin moves with it. The pipe below it has a Piranha Plant, so either time your jump or kill it. Ahead, pipes come down from the ceiling. The second Star Coin is between two of these pipes. Use a regular jump or a wall jump to get it, timing it so you land on the moving pipe to the right. The third Star Coin is between two pipes that are low it in the purple water. There's a pipe swinging overhead, so time a quick wall jump to get the Star Coin and land safely. The regular goal is ahead. This opens a path that loops back to the path to Soda Jungle-4 and -5.

In the area with the third Star Coin, between the swinging pipe and the flagpole is a red pipe coming down from the ceiling. Jump on the blue pipe when it swings that way to reach the pipe. This will take you to a painting of Luigi and the red goal. This opens the path to Soda Jungle-6 and -7.

New Super Mario Bros. 2: Flower-1

This is the second special world only accessible by cannon. This level contains lots of snake platforms appearing from and disappearing into pipes. Don't worry about trying to go through the mini pipes; it won't work. The snake platforms will hurt you if you stand on the pipe they're trying to go through or pass over. The first Star Coin is over the void. Drop on to the lower set of snake platforms while dodging the Parakoopas to get it. There will be a snake platform appearing from above, then moving right, then up to go through a pipe. Wait until it starts moving right to jump on it. Wall jump off the snake platform when it returns to the pipe to get the second Star Coin. Make sure not to land on the Piranha Plant. Next is the midpoint and a platforming challenging, using the snake platforms to reach the top of the pipes. At the top are two blue pipes, then a yellow one on the other side of the gap. Drop down the gap sliding down a pipe, then wall jump up for the third Star Coin. Continue to the right for the regular goal to the Ghost House. When you come across two adjacent item blocks, pound the one to the right to make it fly. Stand on it and it will fly up to a new level. The snake platforms form stairs to the Red Goal to Flower-A.

Coin Total: 60,525

New Super Mario Bros. 2: 4-2

This level returns us to the snow. There is a Gold Block to the right of the first red pipe. Jump from the second red pipe for the first Star Coin. Past the random coin block, there are two pipes hanging from above. Wall jump up them and hit the middle block between them for a 1-up. Do not hit any of the other invisible blocks so you can get it. Go right for the midpoint. There will be a red pipe close to the ground between two red pipes. Go through that pipe and use the Buzzy Beetle shell to break the brick block so you can drop down. The shell will continue to activate the POW blocks below, so run quickly and jump for the second Star Coin. Once out of the area, activate the Gold Ring and kill Piranha Plants to make coins come from their pipes. The third Star Coin is next to a pipe with a Piranha Plant. Take the Koopa shell nearby and throw it at the Star Coin. The flag is nearby.

Coin Total: 23,179

New Super Mario Bros. 2: 1-A

We need 5 Star Coins to unlock this level. On the bright side, we get a free save. This is mainly a pipe area. Kick the Koopa shell into the gap to get an item when it bounces off the brick block. Pound the bricks over the one-way arrow door and go down, and you find the first Star Coin over the brick blocks at the bottom. Go right and take the green pipe cannon to the midpoint. For extra coins, go back left and hit an invisible block next to the pipe on the right. This will allow you to hop over the pipe on the left and collect coins on the way down. Walk over to the one-way door to the right and drop down. You'll find two Gold Rings over some Koopas. Activate the first Gold Ring and throw the Koopa shell to the right. Be sure to get the coins coming out of the pipe where the Piranha Plant was. A little farther right is another Koopa and Gold Ring. Send the gold Koopa shell into the stacked Goombas. The brick block under the pipe has the potential to become a Gold Block, so let the Koopa shell hit it. Stand on the pipe directly over the Gold Block to collect the coins that will come out of it. Then pound the brick block above you to turn it into a Gold Block that you can wear. Go right for a pipe cannon up. Go left and kill the giant Piranha Plant, then drop down to where it was to make coins appear above. More coins will appear if you drop down to where the Koopa is. Go back right and kill the Piranhas. Drop down the one-way door and let it close. Then go right for the second Star Coin. Drop down to the ground where you'll find two Piranhas. Go down the pipe, where you'll find a Gold Ring, a Koopa, and some Piranhas. Activate the Gold Ring and kill the Piranhas with the shell to make lots of coins appear from the pipes. Go through the pipe and you'll come out from a pipe stair case. You're near the flag. The third Star Coin is pretty tricky to find. At the top of the staircase, you'll find four pipes floating in the air with Piranhas. Drop down near the one on the left and hit the invisible block under the opening to the pipe to the left of it. Enter that pipe and kill the giant Piranha. (There's a Koopa there, if you need it.) Behind the Piranha is the third Star Coin. Go back through the same pipe, then go to the flag.

Coin Total: 38,876
I didn't play through this level THAT many times. I moved on after trying to find the third Star Coin and came back and found it before I beat the game, and the above total is when I came back. When I gave up, my total was 8871. There are a lot of coins in this level, especially if you start the level with a Gold Block.

New Super Mario Bros.: 3-B

This level is a pipe world. Several pipes contain Piranhas or Fire Piranhas. The first Star Coin can be reached by going past it, down a red pipe, going left, then up. Go back right. To reach the second Star Coin, wall jump up the green pipe with the Fire Piranha and the short red pipe. The third Star Coin is under a pipe, but the gap may be too narrow to get while approaching from the left. Go over the pipe, then under it to reach it. Continue to the right to reach the goal, which leads to 3-C.

New Super Mario Bros. Wii 9-4 -- Pipe Nightmare

It's another automatic sidescroller! There are lots of pipes with Piranhas and tons of Bob-ombs. The Bob-ombs are crawling over some brick blocks near the beginning, so don't let them blow up the entire floor. There is no safety net. The 1st Star Coin is soon after, accessible by wall-jumping up the moving blue pipe. There are more platforms from 9-2, but they won't move until there are at least 2 things standing on them. To remedy the problem are Bob-omb blasters. You may need to clear the platforms, because they will descend into the abyss if you don't clear them off. I threw a Bob-omb at the 2nd Star Coin to get it. Later, there is a Piranha in a horizontal green pipe. I froze it so I could go through the red pipe above it. It takes you just below the 3rd Star Coin, so I just jumped to get it. Freezing the Piranha is tricky because of the sidescrolling and the Bob-ombs. You will end up at the goal just past the Star Coin. This took me 12 tries.