World 7-2 (New Super Mario Bros.)
From the Super Mario Wiki
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This level is a wrap-around level. At the very beginning of the level, the player goes into a Warp Pipe. The Pipe takes Mario into an area with a rising platform, a red Koopa Troopa, and eight Koopa Paratroopas. The rising platform will take Mario between two brick walls, where he must avoid two Koopa Paratroopas. The first Star Coin can be found above the right wall, and a Red Ring can be found higher up and to the left. The player will then see a platform with four Koopa Troopas, and a brick platform that has a ? Block over it. The midway point will appear upon reaching the brick platform. Then, there is a huge wall with a few Koopa Paratroopas flying around. At the top of the wall are two Brick Blocks and two ? Blocks. After that, there is another brick platform holding the second Star Coin. Then, Mario should walk between two sides of a wall with ten Koopa Paratroopas. There will be the third Star Coin to the left and a Pipe to the right. The player must enter the pipe, and it will lead to two Koopa Paratroopas and the flagpole.