Get behind him, then slide (down on the arrow keys.) Press left and right over and over to swing him, and press C to throw.
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run under him when he jumps, then dive (down arrow) for his tail. then press right and left repeatedly. There is a Super Mario 63.
Just jump and then press down (or dive) after that press left and right repeatedly
You have to grab his tail then press left and right arrow keys together
There is no Super Mario 63. But if there was, I'm sure it wouldn't have web browsers in it. But even if it did, I'm sure said web browsers wouldn't have tails.
Once you have confronted Bowser, run past him and grab his tail. Spin him around by moving the control stick in a circle. Once he's going fast enough, throw him into a spiked bomb. He will give you a key which will lead to the basement.