New Super Mario Bros. 2/World 2-5

This level is dominated by sand, which Mario slowly sinks in, and Chain-Chomps, which can be freed by buttstomping their posts. Start by hitting the first ? block you see to get a Super Leaf. Note the Chain-Chomp below. Jump over the second one, but not the third. Instead, stomp on its post to send it off the screen. Then, use the Super Leaf's power to clear the way to the first star coin.

Over the hill, you'll see the fourth and fifth Chain-Chomps. Stomp on the fifth one's post to clear the way to the red pipe. Inside, carefully navigate your way up past the guarding Chain-Chomps to get the second star coin. Then, exit via the blue pipe. You should soon see the midpoint flag. You'll soon enter a more complex area where you'll have to go down as well as right. Hit the second ? block in the area to get a Super Leaf. Heading relatively straight down will lead to the third star coin. Then, head right, going under the last chain-chomp in the area. Jump over or onto the Boomerang Bro on the platform.

Past the Boomerang Bro, there is a Red Ring above two guarding Chain-Chomps. Grabbing its coins will grant a Super Leaf. You can then use it to glide over the last stretch of land and reach the top of the flagpole.