World 4-1 (Super Mario Bros. 3)
From the Super Mario Wiki
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World 4-1 is the first level of Giant Land in Super Mario Bros. 3. This level introduces massive enemies, such as Grand Goombas and Big Koopa Troopas. The level is accessible upon completing World 3- and by going down the south Warp Pipe on the map, and its own completion will unlock World 4-2.
The players starts next to some large pipes, the second of which has a Piranhacus Giganticus, and a low hanging cloud, followed by some more giant enemies and a Giant ? Block containing a power-up that the player has to kick a Koopa Shell into. Afterward are some waterfalls the player can swim up to reach a secret area in the Warp Pipe to the far right, where two 1-Up Mushrooms can be found, along with some Big Berthas. Beyond the waterfalls are a Grand Goomba, a Colossal Koopa Paratroopa, and a Giant ? Block containing a power-up. Continuing on, the player will have to jump across a chasm using pipes and clouds as platforms to reach a pipe leading to the goal.