New Super Mario Bros. U: Acorn Plains-1 -- Acorn Plains Way

We find ourselves in Acorn Plains, a peaceful, green World 1. The acorns we saw in the introduction are Acorn Mushrooms, which will turn Mario into Flying Squirrel Mario, allowing him to glide down to the ground and cling to walls. We can get an extra height boost when jumping by hitting the [ZR] button. The first Acorn Mushroom we can get is in the clutches of a flying squirrel enemy. Glide from the first high ledge to reach the first Star Coin. Go down the next green pipe for the second Star Coin. Return to the main level and you'll see a rising piece of land. To the lower right of it is a hidden area with coins. Nearby is the midpoint. Pound the brick blocks in the ground under the sign with the arrow for more coins. Soon after, you'll see a Piranha Plant, as well as a Red Coin Ring. Use [ZR] to get a boost to a platform overhead with a pipe. The pipe will take you to a free-fall area with a trail of coins. Follow the coins (or stay in the center if you don't have an Acorn Mushroom) for the third Star Coin. Return to the main area and it's a short distance to the flagpole.