World 1-A (New Super Mario Bros. 2)
From the Super Mario Wiki
This level takes place in a maze of pipes, making it similar to Pipe Land from Super Mario Bros. 3. It contains one-way flippers from New Super Mario Bros., pipes that launch Mario and a few Gold Rings to grab many coins from golden enemies. At the end of the stage is the Flag Pole, which is set past four Piranha Plant-infested pipes that can be used to grab the tip of the pole.