Super Mario 3D Land/World 1-3

This is the first level that includes a Mystery Box. By now, you should have already found one on the map (and entered it).

Before the checkpoint flag
You start atop a huge mid-air island near a pair of binoculars (see sidebar for Star Medal 1). Descend the staircase-like island, trying not to get hit by the enemies. Above a Piranha Plant to the left, sometimes, a random-item-block appears. Hit it with good timing to get what you want. After a Koopa, some Para-Biddybuds and a music block, there's a Mystery Box between two coins (you should have already found one on the map screen). Walk into it to enter a tiny room with three ? blocks. The left and middle ones have one coin, the one on the right has an infinite amount of coins. But hurry, you've only got 8 seconds to get all the goods! When you jump out of it, go right and then forwards. You will see a Para-Biddybud Tower. Use the same strategy as with the Goomba Tower. Next, you'll find a green platform with arrows on. Stand on the one pointing away from the camera and grab the coins on the way. Grab the checkpoint flag.