New Super Luigi U: Acorn Plains- 4 -- Piranha Heights

Before entering the level, have Pink Baby Yoshi follow you. This level has pipes and moving mushroom platforms with Piranha Plants. The first Star Coin is above and to the right of the first set of pipes. To the right is a long platform above a mushroom. You'll find an Acorn Mushroom over the mushroom. The second Star Coin is above the second set of pipes. There will be two pipes near the top that have coins between them. Fly between those pipes to reach a pipe to an 8-bit Luigi and the third Star Coin. The pipe on the right will take you to the flagpole.

New Super Mario Bros. U: Acorn Plains-5 -- Rise of the Piranha Plants

This area has lots of Giant Piranhas. The Fire Flower is very helpful here. There are coins under the area near the rising Piranha. The first Star Coin floats over a giant Piranha Plant. Baby Yoshi can help you get it. There's a Hammer Bro in front of the midpoint. The path ahead is slanted and has more giant Piranhas. After them is another Hammer Bro. There's a pipe blocked by a Piranha Plant. Defeat the Piranha, then go through the pipe to an area with the second Star Coin over a couple of giant Piranha Plants. Return to the main level and avoid the Piranha Plants on the ceiling. The third Star Coin is guarded by a Hammer Bro. There is slanted land to the flagpole. This opens the path to the castle and a Mushroom House. Time your jump over the Piranha Plant in the pipe to avoid dealing with it, or backtrack and go past Acorn Plains-4.

New Super Mario Bros. U: Acorn Plains-4 -- Mushroom Heights

It's a mushroom platforming level. Some of the mushrooms move. The clouds overhead conceal coins. Pink Baby Yoshi is a great help here. There are strange-looking Goombas walking on the mushrooms, but they don't walk off. Use Baby Yoshi to reach the first Star Coin over the blue mushroom. The midpoint is on a different blue mushroom. The second Star Coin is under a blue mushroom, but it's over the void. Use Baby Yoshi to get it, repeatedly hitting [ZR], until you're over a mushroom to stand on. Go down the green pipe between the four pink mushrooms that expand and contract. It will take you an area with moving mushrooms and some Goombas. Kill the Goombas first, then activate the Green Coin Ring. This is a new ring, that makes green coins appear in triplets. Get all three before they soon disappear to make another triplet appear. All told, five sets of three green coins will appear. Collect all fifteen green coins to get a powerup. Return to the main level and you'll find the third Star Coin under a tilting green mushroom between two giant Piranhas. Baby Yoshi can't eat giant enemies. It may take a few attempts to get it. After that is the flagpole. This opens the path to the castle.

New Super Mario Bros. U: Acorn Plains-3 -- Yoshi Hill

This level has lots of rolling hills and Monty Moles jumping out of the rocks. There's a Yoshi in an item block. Use Yoshi to flutter jump from the hill for the first Star Coin. There's lots of fruit in the level for Yoshi to eat. If he eats five fruits, he'll lay an egg with a powerup. If Yoshi eats the powerup, nothing will happen, so just run into it to get it. There are some brick blocks past the first pipe that lead underground to an invisible area. Run underground to the red pipe, which leads to the second Star Coin. It's over the yellow pipes with Piranha Plants and it moves. Once you return to the main level, there will be a stretch of land where eight Monty Moles will appear at once. It's just in front of the midpoint. Coins will appear out of the mole holes if you wait a short while. The next area has raised land with gaps in between to the void. Between two pieces of land with Monty Moles, which are between two yellow platforms, is a red pipe in the gap. This will take you to the third Star Coin. Run and jump to get it. Afterwards are Fire Piranhas and rolling hills leading to the flagpole. This opens the path to Acorn Plains-4 and Acorn Plains 5.

On the path to Acorn Plains-4 is a pink Baby Yoshi. It says it will follow us because it looks like we know where to find food. We take it into Acorn Plains-3 and it will eat small enemies, like Piranha Plants and Monty Moles, but won't touch the fruit. It also sings when you hold it. Press [ZR] to make it balloon so you can reach new areas. We reach the flagpole with it and Toad thanks us for the help and gives us a Super Mushroom. Pink Baby Yoshi still follows us around.