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.