From the Super Mario Wiki
Mario starts in an area near a Semi-Solid Platform and two Goombas with Piranha Plants stacked on them. A Coin Block can be found above the Semi-Solid Platform. A pit can then be found. After the pit, three more Goombas with Piranha Plants stacked on them can be found, along with a ? Block containing a Super Mushroom. Two Semi-Solid Blocks and two Piranha Plants will then be found. After a second pit, a Koopa Troopa and a few Goomba Towers with Piranha Plants on top can be found. A few more Semi-Solid Platforms can be found, along with Big Goombas with Big Piranha Plants stacked on them. The Goal Pole is after the third Big Goomba.
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