From the Super Mario Wiki
The level begins with two ? Blocks, one of them containing a Mystery Mushroom that turns Mario into E. Gadd. The corridor continues past a Boo, as well as a Dry Bones before heading up to some Hard Blocks, which in turn lead to another ? Block and some Big Thwomps, Boos, and Dry Bones before leading to a Warp Pipe. More Boos are encountered, along with a few Lifts. Afterwards, three groups of big Boo Buddies are encountered, with the last one guarding a P Warp Door. Mario must then find some hidden blocks to the right, then climb a beanstalk to a P Switch-spawning Warp Pipe, allowing access to the P Warp Door and the Checkpoint Flag. The next area consists of Lava Lifts and Big Boos on tracks, leading to an area with a single group of big Boo Buddies, which in turn leads directly to a Warp Pipe. The next segment consists mainly of Stretches, as well as Boos in ? Blocks. This leads to a Lava Lift with a trampoline, as well as a high-up staircase to the Goal Pole.
Professor E. Gadd works tirelessly day and night on his studies of spooky spirits. "I fear there may be a new breed of ghost lurking somewhere in this old mansion... Hurry and investigate! You'll have to see for yourself what haunted secrets await."
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