From the Super Mario Wiki
Mario begins the level next to three Buzzy Beetle Shells that are on Tracks. A Buzzy Beetle can be found nearby, along with a Bill Blaster that fires Buzzy Beetle Shells. A ? Block containing a Super Mushroom is above the Bill Blaster. Mario then finds a few more Buzzy Beetles and Bill Blasters that fire Buzzy Beetle Shells. After five Bill Blasters that are directly next to each other, a conveyor can be found, along with a Bill Blaster that fires Spiny Shells. Above a second conveyor, two Super Mushrooms and a 1-Up Mushroom can be found on Tracks. A few more conveyors and Bill Blasters that fire Spiny Shells can then be found. After a ? Block, five more Bill Blasters, two of which are red Bill Blasters, can be found. Four of the Bill Blasters fire Spiny Shells, while the fifth fires Super Mushrooms. After the Bill Blasters is the Goal Pole.
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