World 15-4 (Super Mario Maker for Nintendo 3DS)
From the Super Mario Wiki
After starting the course, Rotating Blocks come down from above. If the player waits too long, the Rotating Blocks move away. However, they can reset the area by going in the nearby Warp Doors on Donut Blocks. After getting on the Rotating Blocks, the player can get a Super Mushroom from a ? Block. After this, the player must avoid fire from a Fire Piranha Plant on a Hard Block and some Lava Bubbles. Spike Traps appear through out, but the player can easily avoid them. Afterwards, a cave with Munchers on the bottom appears. The player must Crouch if they are Super Mario due to the Cannons. After the cave, the Rotating Blocks will fall off the tracks and the player must get off. There is a nearby Checkpoint Flag and a ? Block containing a Super Mushroom before a Warp Pipe. After taking the Warp Pipe, two sets of Rotating Blocks start, with one set having wings. While on the non-winged set, the player must avoid Lava Bubbles, including a Big Zigzag Lava Bubble on the track. The player can get the 1-Up Mushroom from the ? Block between the two Lava Bubbles. A Grinder and Skewer are nearby, but due to their nature, these don't threaten the player. The player then gets on the winged set. While on this set, the player must avoid Spike Traps two blocks high followed by Chain Chomps on tracks with Cannons below. A Checkpoint Flag and a ? Block containing a Super Mushroom are near the Warp Pipe back to the main area. After taking the Warp Pipe, two sets of Rotating Blocks with wings start their journey. There are no obstacles, but the player can collect two Pink Coins, which unlocks a Key Door that takes the player to an area where they can get a Fire Flower from a Pipe. Whether the player doesn't take the Key Door or drops down using the Donut Block, the player fights Bowser near the Axe. If they have the Fire Flower, they can defeat Bowser without the Axe.