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THE LAVA CAVE
溶岩洞窟
There are many different ways to do this part of Corona Mountain, and I would recommend finding one that is the best for you or creating your own way around, since that is often easier to remember. Also, since I don't have practice codes I haven't learned speedboat yet so I'll embed a tutorial at the bottom of the page for that.
EXAMPLE
EXPLANATION
Spike Timing
A visual cue: as soon as the spikes partially raise up out of the platform, you can do a spinjump and the platform will be safe by the time you land on it
Rocket Storage
This trick is used to bypass jumping up the clouds to bowser. When you collect the rocket, jump onto the small platform the box is on. Hold R and time a jump so that the rocket goes off right when you hit the ground. If done right, you should stay in place and see a puddle appear behind Mario. Hold R again and, while still holding it, press X twice. Keep holding R and let go just before the rocket goes off. If done right Mario should stay still and the rocket sound should play. After this, hold L and sidestep off the platform