Bowser Retreats, Mario Advances
From the Super Mario Wiki
At the start of the level, is Bowser, enlarged, winged, and moving along a track away from Mario. It is an auto-scrolling level, so Mario must pursue him. The track gets more elaborate as the chase goes on. Lava Bubbles, a Super Mushroom and a Yoshi Egg can be found along the track. There are frequent pits with Lava Bubbles moving along tracks instead of jumping out of the lava like normal. When Mario gets to the bridge, he can hit the axe and drop Bowser into the lava.
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