Danger: Fire Bars!
From the Super Mario Wiki, the Mario encyclopedia
Mario starts the level on a platform next to a pit, along with a Track with three Fire Bars and a Super Mushroom moving along it. Mario must jump on small platforms made of Hard Blocks in order to cross the pit. After the first Track, a platform with coins and a Hidden Block containing a 1-Up Mushroom above it can be found. A second Track with two Fire Bars and a 1-Up Mushroom moving along it can then be found. Dry Bones can be found on the last two platforms made of Hard Blocks. After the second Track, the Goal Pole can be found.
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