New Super Luigi U: Rock-Candy Mines-5 -- Rising Piranhas

Grab Blue Baby Yoshi outside the level to help you with the enemies. This level is filled with Piranha Plants on moving platforms, so having Blue Baby Yoshi is very helpful. The first Star Coin is in the center of the path of a moving yellow platform. The second Star Coin is hidden in the square rock above the three Walking Piranha Plants. Nearby is Luigi's silhouette in the rock. Just past a Piranha Plant on a vertically-moving yellow platform is a set of three blocks. The top block has an Acorn in it. Get the Acorn, then jump back across the gap to the side with the Luigi silhouette. Jump and boost into the rock near the top of the screen. This will take you to the red goal, which opens the path to the red switch.

Past the block with the Acorn are more Giant Piranha Plants. There's a loop of platforms with one in it, along with the third Star Coin. Kill the Giant Piranha Plant with a nearby Koopa shell or with Blue Baby Yoshi's bubbles and get the Star Coin. Keep going and you'll see the regular goal.

New Super Mario Bros. U: Rock-Candy Mines-5 -- Walking Piranha Plants

Before you start the level, you can get Blue Baby Yoshi. Some of the rocks in the level will tilt when you stand on them, and eventually fall off. There are chains in the level to swing from. The walking Piranha Plants will move around, then stop and stretch their necks. In the area with three Piranha Plants and a Koopa, use the shell on the lower right rock to get access to the first Star Coin. There is a large gap in the ceiling next to a Piranha Plant and a chain near the area with platforms. Use the Acorn Mushroom to fly up into the gap to a new area. Hit the P-Switch, stand on the brick blocks, and fly to the left, then boost for the second Star Coin. Past the random item block and midpoint is a Red Coin Ring. There are moving platforms ahead with Walking Piranhas on them. The red pipe in the ground will give you some coins. The third Star Coin is under a ledge. Run and fly under the ledge, stick to the wall, then boost to it, then wall jump to safety. Go right and under a ledge for a green pipe to the red goal. This opens the path to the Fort and a red switch. Otherwise, keep going to the right and swing from a chain to the regular goal. This opens the path to the Fort through the blue switch.

New Super Mario Bros. U: Frosted Glacier-2 -- Cooligan Fields

On the way to the level, we pick up Baby Blue Yoshi, which blows bubbles that turns enemies into coins or power-ups. The level is covered in ice, so moving around is difficult. Go under the blocks for the first Star Coin. Cooligans are all over the level and they're a little difficult to deal with, as they take two hits to defeat. Use the Ice Flower to freeze them. There's a Red Coin Ring past the midpoint. There's a 1-up in an invisible block on the platform next to the area with some pipes. There's an area between two pipes coming down from above. There's a Cooligan as well as coins in the area. Wall jump up between the pipes for the second Star Coin. There are ice pillars ahead. Go down the platforms and bounce off a Cooligan to reach a platform, then hop up the brick blocks to the third Star Coin. There are a lot of Cooligans on the way to the flagpole. This opens the path to the Fort.