From the Super Mario Wiki
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After a cutscene showing the player character entering a Warp Pipe, they will be dropped into the underground area. Directly above the Springboard is a Brick Block containing a 1-Up Mushroom that will begin sliding to the right above a pit with falling lifts. In one of the blocks in the next row of Brick Blocks is a power-up. Using a horizontally moving lift to enter a narrow passage, the player then has to pass Piranha Plants. After the next falling lift is a split path with Piranha Plants and a group of Brick Blocks, in one of which is a Super Star which the player needs to be in a Super or Fire form to collect. Past downward moving lifts is a Hammer Bro. that will charge at the player followed by Bill Blasters and a Piranha Plant before the Warp Pipe to the Goal Pole.