World 7-7 (Super Mario Bros. 3)
From the Super Mario Wiki
In the starting area, the player can fly up and to the right with a flight power-up to find a hidden 1-Up Mushroom. Going through the Warp Pipe will lead to a long area made up of many pipes lined with Munchers. To cross them all, the player has to collect a chain of Super Stars as they run across. The first Super Star is placed just before the Munchers, but the second Super Star is in a ? Block that is placed one block above the Munchers, meaning the player has to crouch and slide while running if they are powered-up with a Super Mushroom or higher. After the third Super Star are three sets of pipes that the player has to jump over. After the third pipes is a pillar of blocks with a ? Block behind it the player needs to quickly collect in order to avoid taking damage. The next pipe afterward is hanging low, so the player needs to crouch and slide to move past it. Afterward is one more pipe the player needs to jump over before the Warp Pipe leading to the goal area, which has a hidden Note Block near the pipe the player can use to reach another 1-Up Mushroom.