New Super Mario Bros. 2: 4-A

To access this level, use five Star Coins in front of the 1-up House. This level features springy pink mushrooms. Making matters more difficult is the fact that the enemies (namely Goombas) also bounce off the mushrooms. So will the coins. Go right, then break the brick blocks to go down and left for the first Star Coin. Just move; jumping will bounce you over the platform. Keep going right, and you'll see some Red Coins. Next, you'll see a blue pipe making infinite Goombas and a green pipe next to it. It's a cannon. The item block on the left will fly away and has a 1-up. The right brick block can become a Gold Block. You'll drop down on the midpoint. Go right and you'll find the second Star Coin high between two blue pipes over a pink mushroom. You can't reach it on your own, so wait for the Goombas to start bouncing on the mushroom and bounce off one to get it. Coins will soon appear from below. Past the red pipe is an item block level with the platform. Pound it to make a Mini Mushroom appear and head to the right. Follow it past some blue pipes and get it, then go under the pipes for the third Star Coin. Go right and coins will appear from below all of the pink mushrooms. Next is the flag.

Coin Total: 40,656
I completed this level after beating the final boss.

New Super Mario Bros.: 4-A

To unlock this level, you need 5 Star Coins. There is purple water in this level. To help us get around, there are vines to swing on and platforms that function like a paddle wheel. We've seen them before in World 3, but we have to be careful not to touch the purple water. There are two of them before the midpoint. Making life difficult are Paratroopas. The first Star Coin is between a red and a green Paratroopa. Nearby is a vine. Bounce off the first green Paratroopa after the first Star Coin to the vine above to reach a pipe. There, you will find Koopas trapped in brick blocks with the second Star Coin. There is a P-Switch that will turn the brick blocks into coins so you can reach it and get coins. The pipe at the end will return you to the main level. This part has Piranha Plants in it. There is a set of three pipes: green, yellow, green. Enter the first green pipe to reach the third Star Coin. To reach the flagpole, take the vine at the end to the pipe, then another vine to the platform in front of the flagpole. This will open a path to the Ghost House.